/* ==========================================================================
   CQUPT Schedule App Official Website Stylesheet (Single-Screen Landing Edition)
   Design Language: Dark Futuristic, Premium Glassmorphism, Dynamic Animations
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. RESET & CSS VARIABLES
   -------------------------------------------------------------------------- */
:root {
    /* Fonts */
    --font-primary: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    --font-display: 'Outfit', 'Noto Sans SC', sans-serif;

    /* Color Palette (Sage & Emerald Green Theme - Default Dark Mode) */
    --bg-dark: #070b09;
    --bg-dark-gray: #0e1411;
    
    --primary: #2e694b;       /* Sage Forest Green Theme Color */
    --primary-glow: rgba(46, 105, 75, 0.35);
    --secondary: #4da677;     /* Vibrant Sage Green */
    --secondary-glow: rgba(77, 166, 119, 0.35);
    --accent: #9be3be;        /* Light Mint */
    --pink: #63997b;          /* Sage gradient support */
    
    --text-primary: #f0f7f3;  /* Crisp Fresh Off-White */
    --text-secondary: #8fa89b; /* Mint Muted Gray-Green */
    --text-muted: #5b7367;
    
    --border-glass: rgba(46, 105, 75, 0.15); /* Minimalist Sage Line Style */
    --bg-glass: rgba(255, 255, 255, 0.015);
    
    --card-bg: rgba(14, 20, 17, 0.4);
    --card-bg-hover: rgba(14, 20, 17, 0.6);
    --card-border: rgba(46, 105, 75, 0.2);
    --card-border-hover: rgba(77, 166, 119, 0.5);
    --card-shadow-hover: rgba(46, 105, 75, 0.35);
    
    --header-bg: rgba(7, 11, 9, 0.6);
    --header-bg-scrolled: rgba(7, 11, 9, 0.85);
    --footer-bg: #080d0a;
    --phone-bg: #090e0c;
    --phone-border: #16241e;
    --phone-glow-glow: rgba(46, 105, 75, 0.15);
    --btn-primary-end: #17422c;
    --btn-outline-bg: rgba(255, 255, 255, 0.015);
    --btn-outline-hover-bg: rgba(255, 255, 255, 0.08);
    --orb-blend-mode: screen;
    --orb-opacity: 0.45;
    --text-glow-gradient: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);

    /* Layout Variables */
    --container-max-width: 1200px;
    --header-height: 80px;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: light) {
    :root {
        /* Color Palette (Sage & Light Mint Theme - Light Mode) */
        --bg-dark: #f5fcf8;        /* Fresh Mint Light Gray-White */
        --bg-dark-gray: #e6f2eb;   /* Lighter mint card container background */
        
        --primary: #2e694b;       /* Keep core brand sage green! */
        --primary-glow: rgba(46, 105, 75, 0.15);
        --secondary: #3b825a;     /* Slightly darker vibrant green for readability in light mode */
        --secondary-glow: rgba(46, 105, 75, 0.15);
        --accent: #2e694b;
        --pink: #487c60;
        
        --text-primary: #122119;  /* Deep forest charcoal for high contrast reading */
        --text-secondary: #4a6656; /* Mid sage-gray green for body text */
        --text-muted: #738f7e;
        
        --border-glass: rgba(46, 105, 75, 0.12); /* Clean light green minimalist line styles */
        --bg-glass: rgba(46, 105, 75, 0.02);
        
        --card-bg: rgba(255, 255, 255, 0.85); /* Clean white card base */
        --card-bg-hover: rgba(255, 255, 255, 0.95);
        --card-border: rgba(46, 105, 75, 0.15);
        --card-border-hover: rgba(46, 105, 75, 0.4);
        --card-shadow-hover: rgba(46, 105, 75, 0.12);
        
        --header-bg: rgba(245, 252, 248, 0.7);
        --header-bg-scrolled: rgba(245, 252, 248, 0.92);
        --footer-bg: #eaf5ee;
        --phone-bg: #ffffff;
        --phone-border: #d2e5db;
        --phone-glow-glow: rgba(46, 105, 75, 0.08);
        --btn-primary-end: #3b825a;
        --btn-outline-bg: rgba(46, 105, 75, 0.03);
        --btn-outline-hover-bg: rgba(46, 105, 75, 0.08);
        --orb-blend-mode: normal;
        --orb-opacity: 0.18;
        --text-glow-gradient: linear-gradient(135deg, #122119 0%, #4a6656 100%);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --------------------------------------------------------------------------
   2. DYNAMIC BACKGROUND GLOW ORBS
   -------------------------------------------------------------------------- */
.bg-glow-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: var(--orb-opacity);
    mix-blend-mode: var(--orb-blend-mode);
    pointer-events: none;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--primary) 0%, rgba(46, 105, 75, 0) 70%);
    top: -100px;
    right: -100px;
    animation: floatOrb 20s infinite alternate ease-in-out;
}

.orb-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--secondary) 0%, rgba(77, 166, 119, 0) 70%);
    top: 600px;
    left: -200px;
    animation: floatOrb 25s infinite alternate-reverse ease-in-out;
}

.orb-3 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, var(--pink) 0%, rgba(99, 153, 123, 0) 70%);
    bottom: -100px;
    right: -100px;
    animation: floatOrb 18s infinite alternate ease-in-out;
}

@keyframes floatOrb {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(80px, 50px) scale(1.15); }
}

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY & UTILITIES
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

p {
    color: var(--text-secondary);
}

.text-gradient {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 50%, var(--pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 12px 28px;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-normal);
    gap: 10px;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.85rem;
    border-radius: var(--border-radius-sm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #17422c 100%);
    color: white;
    box-shadow: 0 4px 20px rgba(46, 105, 75, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(46, 105, 75, 0.5);
}

.btn-glow {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: 0 0 20px rgba(46, 105, 75, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(46, 105, 75, 0.45);
}

.btn-outline {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* --------------------------------------------------------------------------
   4. HEADER / NAVIGATION
   -------------------------------------------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    background-color: var(--header-bg-scrolled);
    height: 70px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 12px;
}

.logo-icon {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    overflow: hidden;
}

.logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.logo-text {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.35rem;
    background: var(--text-glow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.01em;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* --------------------------------------------------------------------------
   5. HERO SECTION
   -------------------------------------------------------------------------- */
.hero-section {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 40px;
    position: relative;
    overflow: hidden;
    flex: 1;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 60px;
    width: 100%;
}

.hero-content {
    display: flex;
    flex-direction: column;
}

.hero-community {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    position: relative;
    background: rgba(46, 105, 75, 0.1);
    border: 1px solid rgba(46, 105, 75, 0.25);
    padding: 6px 14px 6px 16px;
    border-radius: 50px;
    margin-bottom: 24px;
    align-self: flex-start;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.hero-community:hover {
    border-color: rgba(77, 166, 119, 0.5);
    background: rgba(46, 105, 75, 0.15);
    transform: translateY(-2px);
}

.community-text {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
}

.community-text strong {
    color: var(--secondary);
    margin-left: 2px;
}

.btn-text-copy {
    background: rgba(46, 105, 75, 0.18);
    border: 1px solid rgba(46, 105, 75, 0.3);
    color: var(--secondary);
    padding: 4px 10px;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all var(--transition-fast);
}

.btn-text-copy:hover {
    background: var(--primary);
    border-color: var(--secondary);
    color: #ffffff;
}

.copy-toast {
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(10px);
    margin-left: 10px;
    background: var(--primary);
    border: 1px solid var(--secondary);
    color: #ffffff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(46, 105, 75, 0.2);
    z-index: 100;
}

.copy-toast.show {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.15;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 40px;
    line-height: 1.7;
    max-width: 580px;
}

/* Download Panel */
.hero-download-panel {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 24px;
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    margin-bottom: 28px;
    max-width: 620px;
    transition: all var(--transition-normal);
}

.hero-download-panel:hover {
    border-color: var(--card-border-hover);
    box-shadow: 0 15px 45px var(--card-shadow-hover);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;
}

.download-buttons .btn {
    text-align: left;
    justify-content: flex-start;
    padding: 12px 20px;
}

.btn-label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
}

.btn-subtext {
    display: block;
    font-size: 0.75rem;
    color: inherit;
    opacity: 0.7;
    font-weight: 400;
    margin-top: 2px;
}

.download-qr-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    padding-left: 30px;
}

.qr-container {
    width: 100px;
    height: 100px;
    background: white;
    border-radius: var(--border-radius-sm);
    padding: 6px;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.qr-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 2px;
}

.qr-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.qr-desc {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.copy-svg {
    width: 12px;
    height: 12px;
}

/* Features Section (2 Columns Grid) */
.features-section {
    padding: 100px 0;
    position: relative;
    z-index: 10;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px auto;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: var(--text-glow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    width: 100%;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    background: var(--card-bg-hover);
    border-color: var(--card-border-hover);
    transform: translateY(-5px);
    box-shadow: 0 15px 45px var(--card-shadow-hover);
}

.feature-card .feature-icon {
    font-size: 2rem;
    line-height: 1.2;
}

.feature-info {
    flex: 1;
}

.feature-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

/* Hero Phone Mockup Display */
.hero-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.phone-frame-container {
    position: relative;
    width: 290px;
    height: 580px;
    z-index: 10;
}

.phone-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 110%;
    height: 110%;
    background: radial-gradient(circle, var(--primary-glow) 0%, rgba(0,0,0,0) 65%);
    z-index: -1;
    opacity: 0.75;
}

.phone-frame {
    width: 100%;
    height: 100%;
    background: var(--phone-bg);
    border: 5px solid var(--phone-border);
    border-radius: 36px;
    box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.35),
                0 0 0 1px var(--phone-glow-glow);
    overflow: hidden;
    position: relative;
}



.phone-screen-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
    background: #000;
}

.phone-screen-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: opacity var(--transition-normal);
}

/* --------------------------------------------------------------------------
   6. FOOTER
   -------------------------------------------------------------------------- */
.footer {
    border-top: 1px solid var(--border-glass);
    background-color: var(--footer-bg);
    padding: 40px 0;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    gap: 60px;
}

.footer-info {
    max-width: 360px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: cover;
}

.footer-logo span {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.footer-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.copyright {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.copyright a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.copyright a:hover {
    color: var(--secondary);
}

.footer-links-group {
    display: flex;
    gap: 80px;
}

.footer-link-col h4 {
    font-size: 0.95rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-link-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link-col a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-link-col a:hover {
    color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   7. RESPONSIVE DESIGN (MEDIA QUERIES)
   -------------------------------------------------------------------------- */

/* Tablet viewports (under 1024px) */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .features-section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-download-panel {
        margin-left: auto;
        margin-right: auto;
        width: 100%;
    }
    
    .hero-community {
        align-self: center;
        justify-content: center;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-links-group {
        gap: 40px;
        flex-wrap: wrap;
    }
}

/* Smart Phone viewports (under 768px) */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-download-panel {
        flex-direction: column;
        gap: 20px;
        padding: 20px;
    }
    
    .download-qr-box {
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-left: 0;
        padding-top: 20px;
        width: 100%;
    }
}

/* Micro viewports (under 480px) */
@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .hero-community {
        flex-direction: column;
        gap: 10px;
        border-radius: 18px;
        padding: 10px 16px;
        align-self: center;
    }
    
    .copy-toast {
        left: 50%;
        top: auto;
        bottom: -36px;
        transform: translate(-50%, 6px);
        margin-left: 0;
    }
    
    .copy-toast.show {
        transform: translate(-50%, 0);
    }
    
    .phone-frame-container {
        width: 250px;
        height: 500px;
    }
}