/* ========================================================= */
/* BOTANICAL DARK THEME - FULLY RESPONSIVE DESIGN SYSTEM     */
/* Mobile-First Fluid Typography, Scalable Icons, 100dvh     */
/* ========================================================= */

:root {
    --bg-dark: #09140e;
    --bg-landing: #0c1811;
    --bg-sidebar: #0f1e16;
    --bg-main: #13241b;
    --bg-surface: #193024;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(78, 178, 126, 0.35);
    
    --primary: #4eb27e;
    --primary-hover: #5ec991;
    --primary-glow: rgba(78, 178, 126, 0.28);
    --accent-gold: #e5c158;
    --accent-amber: #f59e0b;
    
    --text-main: #f0f7f3;
    --text-muted: #a3beaf;
    --text-dim: #6e8c7c;
    
    --user-bubble: #1f3d2d;
    --doctor-bubble: rgba(255, 255, 255, 0.03);
    
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, -apple-system, sans-serif;
    
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition: all 0.22s cubic-bezier(0.2, 0, 0, 1);
}

/* Global Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Helpers */
.hidden {
    display: none !important;
}

.gradient-text {
    background: linear-gradient(135deg, #e5c158 0%, #4eb27e 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* ========================================================= */
/* 1. LANDING PAGE VIEW (Fluid, Scalable & Mobile Friendly)  */
/* ========================================================= */
.landing-page-view {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    background: radial-gradient(circle at 50% 0%, #152b20 0%, var(--bg-dark) 70%);
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.3s ease-out;
}

/* Landing Navigation */
.landing-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(12, 24, 17, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: clamp(0.6rem, 1.5vw, 0.9rem) 0;
}

.landing-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 3vw, 2rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.landing-brand {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1.2vw, 0.75rem);
    cursor: pointer;
    text-decoration: none;
}

.brand-icon {
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
    color: var(--primary);
    filter: drop-shadow(0 0 10px var(--primary-glow));
    flex-shrink: 0;
}

.landing-brand-title {
    font-family: var(--font-serif);
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.1;
}

.landing-brand-title .accent {
    color: var(--primary);
}

.landing-brand-tag {
    font-size: clamp(0.65rem, 1vw, 0.72rem);
    color: var(--text-dim);
    display: block;
    white-space: nowrap;
}

.landing-nav-links {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2vw, 1.75rem);
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: clamp(0.8rem, 1.2vw, 0.88rem);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
}

.landing-nav-actions {
    display: flex;
    align-items: center;
    gap: clamp(0.4rem, 1vw, 0.85rem);
    flex-wrap: wrap;
}

/* Header Website UI Language Selector */
.lang-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: clamp(0.25rem, 0.8vw, 0.35rem) clamp(0.5rem, 1vw, 0.75rem);
    transition: var(--transition);
}

.lang-selector-wrapper:hover, .lang-selector-wrapper:focus-within {
    border-color: var(--border-highlight);
    background: var(--bg-card-hover);
}

.lang-icon {
    font-size: clamp(0.75rem, 1vw, 0.85rem);
    color: var(--accent-gold);
}

.lang-selector-label {
    font-size: clamp(0.68rem, 0.9vw, 0.75rem);
    font-weight: 600;
    color: var(--text-dim);
}

.lang-select {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: clamp(0.75rem, 1vw, 0.82rem);
    font-weight: 600;
    cursor: pointer;
    max-width: 110px;
}

.lang-select option {
    background: #15291e;
    color: var(--text-main);
}

/* Auth Buttons */
.auth-btn-wrapper {
    display: flex;
    align-items: center;
}

.btn-auth-outline {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: clamp(0.75rem, 1vw, 0.82rem);
    font-weight: 600;
    padding: clamp(0.3rem, 0.8vw, 0.4rem) clamp(0.6rem, 1.2vw, 0.85rem);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
    min-height: 34px;
}

.btn-auth-outline:hover {
    border-color: var(--primary);
    background: rgba(78, 178, 126, 0.12);
    color: var(--primary);
}

.auth-user-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: rgba(78, 178, 126, 0.1);
    border: 1px solid rgba(78, 178, 126, 0.25);
    padding: clamp(0.25rem, 0.6vw, 0.35rem) clamp(0.5rem, 1vw, 0.75rem);
    border-radius: var(--radius-full);
    font-size: clamp(0.74rem, 0.95vw, 0.8rem);
    color: var(--primary);
    font-weight: 600;
    min-height: 34px;
}

.auth-user-name {
    max-width: clamp(70px, 12vw, 130px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-main);
}

.btn-auth-logout {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0 0.25rem;
    transition: var(--transition);
}

.btn-auth-logout:hover {
    color: #ef4444;
}

.btn-primary-glow {
    background: var(--primary);
    color: var(--bg-dark);
    border: none;
    font-family: var(--font-sans);
    font-size: clamp(0.78rem, 1vw, 0.85rem);
    font-weight: 700;
    padding: clamp(0.4rem, 0.9vw, 0.5rem) clamp(0.85rem, 1.5vw, 1.25rem);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 0 16px var(--primary-glow);
    transition: var(--transition);
    min-height: 34px;
}

.btn-primary-glow:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 0 22px rgba(78, 178, 126, 0.45);
}

/* Landing Hero Section */
.landing-hero {
    max-width: 1000px;
    margin: 0 auto;
    padding: clamp(2rem, 5vw, 4.5rem) clamp(1rem, 3vw, 2rem) clamp(1.5rem, 3vw, 3rem);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(229, 193, 88, 0.1);
    color: var(--accent-gold);
    border: 1px solid rgba(229, 193, 88, 0.25);
    padding: clamp(0.3rem, 0.8vw, 0.45rem) clamp(0.75rem, 1.8vw, 1.25rem);
    border-radius: var(--radius-full);
    font-size: clamp(0.72rem, 1.1vw, 0.82rem);
    font-weight: 600;
    margin-bottom: clamp(1rem, 2.5vw, 1.75rem);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(1.85rem, 4.5vw + 0.5rem, 3.35rem);
    line-height: 1.18;
    color: var(--text-main);
    margin-bottom: clamp(0.9rem, 2vw, 1.5rem);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(0.88rem, 1.3vw + 0.3rem, 1.05rem);
    color: var(--text-muted);
    max-width: 780px;
    line-height: 1.65;
    margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.hero-cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.75rem, 2vw, 1.25rem);
    flex-wrap: wrap;
    margin-bottom: clamp(2rem, 4vw, 3.5rem);
    width: 100%;
}

.btn-hero-primary {
    background: linear-gradient(135deg, #4eb27e 0%, #3d9e6c 100%);
    color: var(--bg-dark);
    font-family: var(--font-sans);
    font-size: clamp(0.9rem, 1.3vw, 1.05rem);
    font-weight: 700;
    padding: clamp(0.75rem, 1.5vw, 0.95rem) clamp(1.35rem, 2.5vw, 2rem);
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    box-shadow: 0 8px 24px var(--primary-glow);
    transition: var(--transition);
    min-height: 48px;
}

.btn-hero-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(78, 178, 126, 0.45);
}

.btn-hero-secondary {
    background: var(--bg-card);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: clamp(0.88rem, 1.2vw, 0.98rem);
    font-weight: 600;
    padding: clamp(0.75rem, 1.5vw, 0.95rem) clamp(1.2rem, 2vw, 1.65rem);
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    transition: var(--transition);
    min-height: 48px;
}

.btn-hero-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-highlight);
}

/* Hero Popular Inquiries Grid */
.hero-prompts-container {
    width: 100%;
    max-width: 900px;
    margin-top: 0.5rem;
}

.prompts-label {
    display: block;
    font-size: clamp(0.75rem, 1vw, 0.84rem);
    color: var(--text-dim);
    margin-bottom: 0.85rem;
    font-weight: 600;
}

.hero-prompts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    gap: clamp(0.65rem, 1.5vw, 1rem);
    width: 100%;
}

.hero-prompt-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: clamp(0.85rem, 1.8vw, 1.15rem);
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.hero-prompt-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-highlight);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.prompt-icon {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--accent-gold);
    flex-shrink: 0;
    margin-top: 2px;
}

.hero-prompt-card strong {
    display: block;
    font-size: clamp(0.84rem, 1.1vw, 0.92rem);
    color: var(--text-main);
    margin-bottom: 0.2rem;
}

.hero-prompt-card p {
    font-size: clamp(0.72rem, 0.95vw, 0.78rem);
    color: var(--text-dim);
    line-height: 1.35;
}

/* Stats Bar */
.landing-stats-bar {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: rgba(9, 20, 14, 0.6);
    padding: clamp(1.25rem, 3vw, 2rem) clamp(1rem, 3vw, 2rem);
}

.stats-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr));
    gap: clamp(1rem, 2vw, 2rem);
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(1.6rem, 3.5vw, 2.5rem);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: clamp(0.72rem, 1vw, 0.8rem);
    color: var(--text-muted);
}

/* Landing Sections */
.landing-section {
    max-width: 1100px;
    margin: 0 auto;
    padding: clamp(3rem, 6vw, 5rem) clamp(1rem, 3vw, 2rem);
    text-align: center;
    width: 100%;
}

.landing-section.dark-alt {
    max-width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-badge {
    display: inline-block;
    font-size: clamp(0.7rem, 0.9vw, 0.75rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.45rem, 3vw + 0.3rem, 2.25rem);
    color: var(--text-main);
    margin-bottom: clamp(0.5rem, 1.5vw, 0.85rem);
}

.section-sub {
    font-size: clamp(0.84rem, 1.1vw, 0.95rem);
    color: var(--text-muted);
    max-width: 620px;
    margin: 0 auto clamp(2rem, 4vw, 3rem);
    line-height: 1.6;
}

/* Steps Grid */
.landing-steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: clamp(1rem, 2.5vw, 1.75rem);
    text-align: left;
}

.landing-step-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: clamp(1.25rem, 2.5vw, 1.85rem);
    position: relative;
    transition: var(--transition);
}

.landing-step-card:hover {
    border-color: var(--border-highlight);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
}

.step-badge {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
}

.step-icon-box {
    width: clamp(40px, 6vw, 48px);
    height: clamp(40px, 6vw, 48px);
    border-radius: var(--radius-sm);
    background: rgba(78, 178, 126, 0.12);
    border: 1px solid rgba(78, 178, 126, 0.25);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    margin-bottom: 1.25rem;
}

.landing-step-card h3 {
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.landing-step-card p {
    font-size: clamp(0.8rem, 1vw, 0.88rem);
    color: var(--text-muted);
    line-height: 1.55;
}

/* Pillars Grid */
.landing-pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
    gap: clamp(0.85rem, 2vw, 1.5rem);
    text-align: left;
    max-width: 1100px;
    margin: 0 auto;
}

.landing-pillar-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: clamp(1rem, 2vw, 1.5rem);
    transition: var(--transition);
}

.landing-pillar-card:hover {
    border-color: var(--border-highlight);
    background: var(--bg-card-hover);
}

.pillar-icon {
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    color: var(--accent-gold);
    margin-bottom: 0.85rem;
    display: block;
}

.landing-pillar-card h4 {
    font-size: clamp(0.9rem, 1.2vw, 1rem);
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

.landing-pillar-card p {
    font-size: clamp(0.78rem, 1vw, 0.84rem);
    color: var(--text-muted);
    line-height: 1.5;
}

/* Scripture Chips Grid */
.scriptures-chips-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: clamp(0.4rem, 1vw, 0.75rem);
    max-width: 900px;
    margin: 0 auto;
}

.scripture-chip {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: clamp(0.35rem, 0.8vw, 0.5rem) clamp(0.75rem, 1.5vw, 1.1rem);
    font-size: clamp(0.75rem, 1vw, 0.82rem);
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    transition: var(--transition);
}

.scripture-chip i {
    color: var(--primary);
}

.scripture-chip:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    color: var(--text-main);
}

/* FAQ Container */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: clamp(0.75rem, 1.5vw, 1rem);
    text-align: left;
}

.faq-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: clamp(1rem, 2vw, 1.35rem);
}

.faq-card h4 {
    font-size: clamp(0.88rem, 1.2vw, 0.98rem);
    color: var(--text-main);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.faq-card h4 i {
    color: var(--primary);
    flex-shrink: 0;
}

.faq-card p {
    font-size: clamp(0.8rem, 1vw, 0.86rem);
    color: var(--text-muted);
    line-height: 1.55;
    padding-left: 1.5rem;
}

/* Bottom CTA Banner */
.landing-cta-banner {
    background: radial-gradient(circle at 50% 50%, #173826 0%, #0c1811 100%);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: clamp(2.5rem, 5vw, 4.5rem) clamp(1rem, 3vw, 2rem);
    text-align: center;
}

.landing-cta-banner h2 {
    font-family: var(--font-serif);
    font-size: clamp(1.4rem, 3vw + 0.3rem, 2.25rem);
    color: var(--text-main);
    margin-bottom: 0.6rem;
}

.landing-cta-banner p {
    font-size: clamp(0.85rem, 1.1vw, 0.95rem);
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

/* Landing Footer */
.landing-footer {
    padding: clamp(1.5rem, 3vw, 2.5rem) clamp(1rem, 3vw, 2rem);
    border-top: 1px solid var(--border);
    background: var(--bg-dark);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-serif);
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    font-weight: 700;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.4rem, 1vw, 0.75rem);
    flex-wrap: wrap;
    font-size: clamp(0.75rem, 1vw, 0.82rem);
    color: var(--text-dim);
}

.btn-legal-link {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.btn-legal-link:hover {
    color: var(--primary);
}

.footer-github {
    color: var(--text-muted);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: var(--transition);
}

.footer-github:hover {
    color: var(--text-main);
}

.footer-copy {
    font-size: clamp(0.68rem, 0.9vw, 0.75rem);
    color: var(--text-dim);
}

/* ========================================================= */
/* 2. CHATGPT-STYLE APP LAYOUT (100dvh & Mobile Slide-In)     */
/* ========================================================= */
.app-layout {
    display: flex;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    position: relative;
}

/* Mobile Sidebar Backdrop Overlay */
.sidebar-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 80;
    animation: fadeIn 0.2s ease-out;
}

/* Collapsible / Responsive Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    transition: transform 0.28s cubic-bezier(0.2, 0, 0, 1), width 0.28s cubic-bezier(0.2, 0, 0, 1);
    z-index: 90;
    flex-shrink: 0;
    height: 100%;
}

.sidebar.collapsed {
    transform: translateX(-100%);
    width: 0;
    padding: 0;
    margin: 0;
    border: none;
    overflow: hidden;
}

.sidebar-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar .brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.sidebar .brand-text h2 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1;
}

.sidebar .brand-text .tagline {
    font-size: 0.68rem;
    color: var(--text-dim);
    display: block;
}

.icon-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    padding: 0.45rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-toggle-btn:hover {
    color: var(--text-main);
    background: var(--bg-card-hover);
}

.home-nav-btn {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.6rem 0.9rem;
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    min-height: 38px;
}

.home-nav-btn:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
    border-color: var(--border-highlight);
}

.new-chat-btn {
    background: var(--bg-surface);
    color: var(--text-main);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.7rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    transition: var(--transition);
    min-height: 42px;
}

.new-chat-btn:hover {
    background: var(--primary);
    color: var(--bg-dark);
    border-color: var(--primary);
    box-shadow: 0 4px 14px var(--primary-glow);
}

/* Sidebar History & Sections */
.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

#sidebar-history-section {
    flex: 1;
    overflow-y: auto;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 0.35rem;
}

.sidebar-section .section-title {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-dim);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.text-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0.2rem 0.4rem;
}

.text-btn:hover {
    color: var(--accent-amber);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.82rem;
    cursor: pointer;
    transition: var(--transition);
    min-height: 36px;
}

.history-item:hover, .history-item.active {
    background: var(--bg-card-hover);
    color: var(--text-main);
}

.history-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 190px;
}

.btn-delete-session {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 0.75rem;
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition);
    padding: 0.3rem;
}

.history-item:hover .btn-delete-session {
    opacity: 1;
}

.btn-delete-session:hover {
    color: #ef4444;
}

.quick-prompts-list {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.prompt-chip {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    text-align: left;
    padding: 0.5rem 0.65rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: 34px;
}

.prompt-chip:hover {
    background: var(--bg-card-hover);
    color: var(--text-main);
}

.sidebar-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.65rem;
    border-top: 1px solid var(--border);
}

.corpus-badge {
    background: rgba(78, 178, 126, 0.1);
    color: var(--primary);
    border: 1px solid rgba(78, 178, 126, 0.2);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.settings-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    font-size: 1rem;
    cursor: pointer;
    padding: 0.4rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-btn:hover {
    color: var(--text-main);
    background: var(--bg-card-hover);
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-main);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    position: relative;
    width: 100%;
}

/* App Header */
.app-header {
    height: 60px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 clamp(0.75rem, 2vw, 1.5rem);
    background: rgba(19, 36, 27, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 10;
    flex-shrink: 0;
    gap: 0.5rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1.5vw, 1rem);
    min-width: 0;
}

.sidebar-toggle-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
    color: var(--text-main);
    border-color: var(--primary);
    background: var(--bg-card-hover);
}

.doctor-profile {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1vw, 0.85rem);
    min-width: 0;
}

.avatar-wrapper {
    position: relative;
    width: clamp(30px, 4vw, 36px);
    height: clamp(30px, 4vw, 36px);
    flex-shrink: 0;
}

.doctor-avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
}

.status-dot {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    border: 2px solid var(--bg-dark);
}

.doctor-info {
    min-width: 0;
}

.doctor-info h3 {
    font-size: clamp(0.82rem, 1.1vw, 0.92rem);
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doctor-info p {
    font-size: clamp(0.65rem, 0.9vw, 0.72rem);
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-right {
    display: flex;
    align-items: center;
    gap: clamp(0.35rem, 1vw, 0.75rem);
    flex-shrink: 0;
}

.rerank-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    font-size: clamp(0.72rem, 0.9vw, 0.78rem);
    color: var(--text-muted);
    font-weight: 500;
}

.rerank-toggle input {
    display: none;
}

.toggle-track {
    width: 28px;
    height: 16px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    position: relative;
    transition: var(--transition);
}

.toggle-track::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 2px;
    width: 12px;
    height: 12px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
}

.rerank-toggle input:checked + .toggle-track {
    background: var(--primary);
}

.rerank-toggle input:checked + .toggle-track::before {
    transform: translateX(12px);
}

.header-link-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: clamp(0.72rem, 0.9vw, 0.78rem);
    font-weight: 600;
    padding: 0.35rem clamp(0.5rem, 1vw, 0.75rem);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: var(--transition);
    min-height: 32px;
}

.header-link-btn:hover {
    color: var(--text-main);
    border-color: var(--border-highlight);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    padding: 0.4rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-width: 32px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--text-main);
    background: var(--bg-card-hover);
}

/* Chat View Container */
.view-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 60px);
    height: calc(100dvh - 60px);
    overflow: hidden;
    position: relative;
}

/* Chat Messages (ChatGPT Style Centered Layout) */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: clamp(1rem, 3vw, 2rem) clamp(0.75rem, 2.5vw, 1.5rem);
    display: flex;
    flex-direction: column;
    gap: clamp(1rem, 2vw, 1.5rem);
    max-width: 820px;
    width: 100%;
    margin: 0 auto;
}

/* Welcome Screen */
.welcome-screen {
    text-align: center;
    margin: auto 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: fadeIn 0.3s ease-out;
    padding: 1rem 0;
}

.welcome-icon {
    width: clamp(48px, 8vw, 56px);
    height: clamp(48px, 8vw, 56px);
    background: rgba(78, 178, 126, 0.12);
    border: 1px solid rgba(78, 178, 126, 0.25);
    color: var(--primary);
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.85rem;
    box-shadow: 0 0 20px var(--primary-glow);
}

.welcome-screen h1 {
    font-family: var(--font-serif);
    font-size: clamp(1.4rem, 3vw + 0.3rem, 1.85rem);
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

.welcome-subtitle {
    font-size: clamp(0.82rem, 1.1vw, 0.9rem);
    color: var(--text-muted);
    max-width: 620px;
    line-height: 1.55;
    margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.welcome-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    gap: clamp(0.65rem, 1.5vw, 0.85rem);
    width: 100%;
}

.welcome-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: clamp(0.85rem, 1.8vw, 1.15rem);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.welcome-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-highlight);
    transform: translateY(-2px);
}

.welcome-card i {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--accent-gold);
    margin-bottom: 0.4rem;
}

.welcome-card h4 {
    font-size: clamp(0.84rem, 1.1vw, 0.9rem);
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.2rem;
}

.welcome-card p {
    font-size: clamp(0.72rem, 0.95vw, 0.78rem);
    color: var(--text-dim);
    line-height: 1.35;
}

/* Chat Message Rows */
.message-row {
    display: flex;
    gap: clamp(0.5rem, 1.2vw, 0.85rem);
    width: 100%;
    animation: messageSlide 0.25s ease-out;
}

@keyframes messageSlide {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-row.user {
    justify-content: flex-end;
}

.message-row.doctor {
    justify-content: flex-start;
}

.message-avatar {
    width: clamp(28px, 4vw, 32px);
    height: clamp(28px, 4vw, 32px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
    font-size: clamp(0.8rem, 1vw, 0.9rem);
}

.message-row.doctor .message-avatar {
    background: rgba(78, 178, 126, 0.15);
    color: var(--primary);
    border: 1px solid var(--border-highlight);
}

.message-bubble {
    max-width: min(88%, 700px);
    border-radius: var(--radius-md);
    padding: clamp(0.85rem, 2vw, 1.25rem) clamp(1rem, 2.5vw, 1.45rem);
    font-size: clamp(0.85rem, 1.1vw, 0.92rem);
    line-height: 1.65;
    word-break: break-word;
}

.message-row.user .message-bubble {
    background: var(--user-bubble);
    border: 1px solid rgba(78, 178, 126, 0.25);
    color: #e6f4ec;
    border-top-right-radius: 4px;
}

.message-row.doctor .message-bubble {
    background: var(--doctor-bubble);
    border: 1px solid var(--border);
    border-top-left-radius: 4px;
    color: var(--text-main);
    width: 100%;
}

/* Perplexity Style Sources Tray */
.sources-tray {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.sources-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-dim);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.sources-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.source-chip {
    background: rgba(229, 193, 88, 0.08);
    border: 1px solid rgba(229, 193, 88, 0.25);
    color: var(--accent-gold);
    border-radius: var(--radius-full);
    padding: 0.25rem 0.6rem;
    font-size: clamp(0.7rem, 0.9vw, 0.75rem);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    cursor: pointer;
    transition: var(--transition);
    max-width: 100%;
}

.source-chip:hover {
    background: rgba(229, 193, 88, 0.18);
    border-color: var(--accent-gold);
}

.source-chip .chip-num {
    background: var(--accent-gold);
    color: var(--bg-dark);
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.62rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* Inline Citations */
.inline-citation {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(229, 193, 88, 0.15);
    color: var(--accent-gold);
    border: 1px solid rgba(229, 193, 88, 0.3);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0 4px;
    margin: 0 2px;
    border-radius: 4px;
    cursor: pointer;
    vertical-align: super;
    text-decoration: none;
    transition: var(--transition);
}

.inline-citation:hover {
    background: var(--accent-gold);
    color: var(--bg-dark);
}

/* Markdown Typography */
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
    font-family: var(--font-serif);
    color: var(--text-main);
    margin-top: 1.15rem;
    margin-bottom: 0.45rem;
}

.markdown-body h1 { font-size: clamp(1.15rem, 2vw, 1.35rem); color: var(--primary); }
.markdown-body h2 { font-size: clamp(1.02rem, 1.6vw, 1.15rem); border-bottom: 1px solid var(--border); padding-bottom: 0.25rem; }
.markdown-body h3 { font-size: clamp(0.92rem, 1.3vw, 1rem); }

.markdown-body p { margin-bottom: 0.75rem; }
.markdown-body ul, .markdown-body ol { margin-bottom: 0.75rem; padding-left: 1.25rem; }
.markdown-body li { margin-bottom: 0.25rem; }
.markdown-body strong { color: #bbf0d4; }
.markdown-body blockquote {
    border-left: 3px solid var(--primary);
    background: rgba(78, 178, 126, 0.05);
    padding: 0.5rem 0.85rem;
    margin: 0.75rem 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
}

/* Real-time Streaming Cursor */
.streaming-cursor {
    display: inline-block;
    width: 6px;
    height: 14px;
    background: var(--primary);
    margin-left: 3px;
    vertical-align: text-bottom;
    animation: streamBlink 0.7s infinite;
}

@keyframes streamBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Chat Input Area (Fluid & Responsive) */
.chat-input-area {
    padding: 0.5rem clamp(0.75rem, 2.5vw, 1.5rem) clamp(0.75rem, 2vw, 1.25rem);
    background: linear-gradient(180deg, transparent 0%, var(--bg-main) 35%);
    max-width: 820px;
    width: 100%;
    margin: 0 auto;
    flex-shrink: 0;
}

.input-wrapper {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    padding: clamp(0.6rem, 1.5vw, 0.75rem) clamp(0.75rem, 2vw, 1.25rem) clamp(0.5rem, 1.2vw, 0.65rem);
    transition: var(--transition);
    gap: 0.35rem;
}

.input-wrapper:focus-within {
    border-color: var(--border-highlight);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-wrapper textarea {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: clamp(0.85rem, 1.1vw, 0.92rem);
    resize: none;
    max-height: 160px;
    line-height: 1.5;
}

.input-wrapper textarea::placeholder {
    color: var(--text-dim);
}

.chat-input-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.35rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    gap: 0.5rem;
}

/* Response Language Selector in Chatbox */
.chat-response-lang-badge {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(229, 193, 88, 0.3);
    border-radius: var(--radius-full);
    padding: 0.2rem clamp(0.4rem, 1vw, 0.6rem);
    transition: var(--transition);
    min-height: 30px;
}

.chat-response-lang-badge:hover, .chat-response-lang-badge:focus-within {
    border-color: var(--accent-gold);
    background: rgba(0, 0, 0, 0.35);
}

.chat-response-lang-badge i {
    font-size: 0.72rem;
    color: var(--accent-gold);
}

.response-label {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.chat-response-select {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.74rem;
    font-weight: 600;
    cursor: pointer;
    max-width: 105px;
}

.chat-response-select option {
    background: #15291e;
    color: var(--text-main);
}

.send-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--bg-dark);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.05);
    background: var(--primary-hover);
}

.send-btn:disabled {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-dim);
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    text-align: center;
    margin-top: 0.35rem;
    font-size: clamp(0.65rem, 0.9vw, 0.72rem);
    color: var(--text-dim);
    line-height: 1.4;
}

/* ========================================================= */
/* 3. MODALS & POPOVERS (Fully Responsive & Isolated)        */
/* ========================================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.78);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: clamp(0.75rem, 2vw, 1.5rem);
}

.modal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: min(480px, calc(100vw - 1.5rem));
    max-height: 90dvh;
    overflow-y: auto;
    padding: clamp(1.25rem, 3vw, 2rem);
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.2s ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-header h3 {
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-close-modal {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.4rem;
    cursor: pointer;
    min-width: 32px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.btn-close-modal:hover {
    color: var(--text-main);
}

/* Auth Modal Tabs */
.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.25rem;
}

.auth-tab {
    flex: 1;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: clamp(0.82rem, 1.1vw, 0.9rem);
    font-weight: 600;
    padding: 0.6rem 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.auth-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.auth-error-msg {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 1.15rem;
}

.form-group label {
    font-size: clamp(0.78rem, 1vw, 0.84rem);
    font-weight: 600;
    color: var(--text-muted);
}

.form-group input {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: var(--font-sans);
    padding: clamp(0.6rem, 1.2vw, 0.7rem) clamp(0.75rem, 1.5vw, 0.9rem);
    font-size: clamp(0.85rem, 1.1vw, 0.9rem);
    outline: none;
    min-height: 40px;
}

.form-group input:focus {
    border-color: var(--primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.btn {
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: clamp(0.8rem, 1vw, 0.85rem);
    font-weight: 600;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
    min-height: 40px;
}

.btn-primary {
    background: var(--primary);
    color: var(--bg-dark);
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--bg-card-hover);
    color: var(--text-muted);
}

.btn-secondary:hover {
    color: var(--text-main);
}

/* Citation Popover (Responsive Boundaries) */
.citation-popover {
    position: fixed;
    background: #193325;
    border: 1px solid var(--accent-gold);
    border-radius: var(--radius-md);
    padding: clamp(0.85rem, 2vw, 1.15rem);
    max-width: min(360px, calc(100vw - 2rem));
    box-shadow: var(--shadow-lg);
    z-index: 300;
    animation: fadeIn 0.2s ease-out;
}

.citation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.45rem;
    font-size: 0.78rem;
}

.citation-book-title {
    font-weight: 700;
    color: var(--accent-gold);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 220px;
}

.citation-page {
    background: rgba(229, 193, 88, 0.15);
    color: var(--accent-gold);
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-size: 0.7rem;
    flex-shrink: 0;
}

.citation-body {
    font-size: clamp(0.76rem, 1vw, 0.82rem);
    color: var(--text-main);
    line-height: 1.5;
    font-style: italic;
    max-height: 180px;
    overflow-y: auto;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.97); }
    to { opacity: 1; transform: scale(1); }
}

/* ========================================================= */
/* 4. RESPONSIVE BREAKPOINTS & MOBILE ADAPTATIONS            */
/* ========================================================= */

/* Large Tablets & Small Laptops (<= 1024px) */
@media (max-width: 1024px) {
    .landing-nav-links {
        gap: 1rem;
    }
}

/* Tablets (<= 850px) */
@media (max-width: 850px) {
    .landing-nav-links {
        display: none;
    }
}

/* Mobile Devices (<= 768px) */
@media (max-width: 768px) {
    .landing-nav-container {
        padding: 0 1rem;
        flex-wrap: nowrap;
        gap: 0.5rem;
    }

    .landing-brand {
        flex-shrink: 0;
        gap: 0.5rem;
    }

    .landing-brand-title {
        white-space: nowrap;
        font-size: 1.15rem;
    }

    .landing-nav-actions {
        flex-wrap: nowrap;
        gap: 0.4rem;
        flex-shrink: 0;
    }

    /* Hide the redundant Start Consultation button in header on mobile to prevent overflow */
    #btn-landing-start {
        display: none !important;
    }

    /* Off-canvas Mobile Drawer for Sidebar */
    .sidebar {
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        width: 82vw;
        max-width: 320px;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .message-bubble {
        max-width: 92%;
    }

    .chat-messages {
        padding: 0.85rem 0.65rem;
    }

    .chat-input-area {
        padding: 0.4rem 0.65rem 0.75rem;
    }

    .hero-cta-group {
        flex-direction: column;
        width: 100%;
    }

    .btn-hero-primary, .btn-hero-secondary {
        width: 100%;
    }

    .lang-select, .chat-response-select {
        max-width: 75px;
    }

    .header-right {
        gap: 0.3rem;
    }

    .header-link-btn span {
        display: none;
    }

    .header-link-btn {
        padding: 0.35rem 0.5rem;
        min-height: 32px;
    }

    .rerank-toggle {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Small Mobile Screens (<= 480px) */
@media (max-width: 480px) {
    .landing-nav-container {
        padding: 0 0.5rem;
        gap: 0.25rem;
    }

    .landing-brand {
        gap: 0.35rem;
    }

    .landing-brand-tag {
        display: none;
    }

    .landing-brand-title {
        font-size: 1rem;
        white-space: nowrap;
    }

    .brand-icon {
        font-size: 1.25rem;
    }

    .lang-selector-wrapper {
        padding: 0.22rem 0.4rem;
        gap: 0.15rem;
    }

    .lang-selector-label {
        display: none;
    }

    .lang-select {
        max-width: 62px;
        font-size: 0.7rem;
    }

    .btn-auth-outline {
        padding: 0.28rem 0.5rem;
        font-size: 0.7rem;
        min-height: 28px;
        gap: 0.2rem;
    }

    .auth-user-pill span.auth-user-name {
        max-width: 60px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        font-size: 0.72rem;
    }

    .hero-badge {
        font-size: 0.65rem;
        padding: 0.25rem 0.55rem;
    }

    .hero-title {
        font-size: 1.65rem;
    }

    .hero-subtitle {
        font-size: 0.88rem;
    }

    .landing-section {
        padding: 2rem 0.65rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.65rem;
    }

    .app-header {
        padding: 0 0.4rem;
        gap: 0.25rem;
    }

    .doctor-avatar {
        width: 28px;
        height: 28px;
    }

    .doctor-info h3 {
        font-size: 0.8rem;
    }

    .doctor-info p {
        display: none;
    }

    .chat-input-controls {
        flex-wrap: wrap;
    }

    .modal-card {
        padding: 1.1rem 0.85rem;
        width: 92vw;
        max-width: 420px;
    }
}