@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400;1,700&display=swap');

:root {
    --background: #ffffff;
    --foreground: #0f172a; /* Slate 900 */
    --primary: #6366f1;    /* Indigo */
    --primary-foreground: #ffffff;
    --secondary: #f43f5e;  /* Rose 500 */
    --muted: rgba(241, 245, 249, 0.7);
    --muted-foreground: #64748b;
    --accent: #fbc2eb;
    --border: rgba(226, 232, 240, 0.4);

    /* Premium Mesh Gradient Background */
    --gradient-main: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(244, 63, 94, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.1) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(244, 63, 94, 0.15) 0px, transparent 50%),
        #f8fafc; /* Slate 50 background */

    --gradient-hero: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.4) 100%);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #f43f5e 100%);
    --gradient-secondary: linear-gradient(135deg, #f43f5e 0%, #fb7185 100%);

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    --radius: 1.25rem;
    --shadow-sm: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --glass: rgba(255, 255, 255, 0.5);
    --glass-blur: blur(24px);
    --glass-border: 1px solid rgba(255, 255, 255, 0.5);
    
    --shadow-glow: 0 10px 30px -10px rgba(99, 102, 241, 0.4);
}

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

body {
    background: var(--gradient-main);
    background-attachment: fixed;
    color: var(--foreground);
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    color: var(--foreground);
    letter-spacing: -0.02em;
}

a {
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Navbar ===== */
.navbar {
    background: var(--glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 50;
    transition: all 0.3s ease;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
}

.logo-text {
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: -0.01em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.logo-icon {
    font-size: 1.6rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--muted-foreground);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.6rem 1.2rem;
    border-radius: 999px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.01em;
    border: 1px solid transparent;
}

.nav-links a:hover {
    color: var(--foreground);
    background: var(--muted);
}

.nav-links a.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

/* ===== Buttons & Emotion States ===== */
.emotion-btn {
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    border: none;
    background: var(--muted);
    color: var(--muted-foreground);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.emotion-btn:hover {
    background: #e2e8f0;
    transform: translateY(-2px);
}

.emotion-btn.active {
    background: var(--gradient-primary);
    color: white !important;
    box-shadow: var(--shadow-glow);
    transform: scale(1.05) translateY(-2px);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.5rem;
    border-radius: 0.625rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    letter-spacing: 0.01em;
}

/* ===== Custom Confirmation Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10000;
    display: none; /* Controlled by JS */
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.show {
    opacity: 1;
    display: flex;
}

.modal-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
    transform: scale(0.95);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    border-top: 4px solid var(--primary);
}

.modal-danger .modal-card {
    border-top: 4px solid var(--secondary);
}

.modal-overlay.show .modal-card {
    transform: scale(1);
}

.modal-body {
    padding: 2rem;
    display: flex;
    gap: 1.25rem;
}

.modal-icon {
    width: 3.5rem;
    height: 3.5rem;
    background: var(--muted);
    color: var(--primary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.modal-icon i {
    width: 1.75rem;
    height: 1.75rem;
}

.modal-content h3 {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

.modal-content p {
    font-size: 1.05rem;
    color: var(--foreground);
    opacity: 0.8;
    line-height: 1.6;
}

.modal-footer {
    padding: 1.25rem 2rem 2rem;
    display: flex;
    gap: 1rem;
}

/* Danger Variant */
.modal-danger .modal-icon {
    background: rgba(239, 68, 68, 0.1);
    color: var(--secondary);
}

.modal-danger #confirm-ok {
    background: var(--gradient-secondary);
}

.btn-primary {
    background: var(--foreground);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    opacity: 0.95;
}

.btn-outline {
    border: 1.5px solid var(--border);
    color: var(--foreground);
    background: #ffffff;
}

.btn-outline:hover {
    background: var(--muted);
    border-color: var(--muted-foreground);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--gradient-hero);
    backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    margin: 2rem;
    border-radius: 2rem;
    overflow: hidden;
    padding: 6rem 2rem;
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.05);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 750px;
    margin: 0 auto;
}

/* Glass Orbs — decorative background shapes */
.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
    pointer-events: none;
}

.orb-1 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, hsla(200, 60%, 85%, 0.8), transparent);
    top: 10%;
    left: -5%;
}

.orb-2 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, hsla(330, 50%, 88%, 0.7), transparent);
    bottom: 5%;
    right: -3%;
}

.orb-3 {
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, hsla(170, 50%, 80%, 0.6), transparent);
    top: 25%;
    right: 15%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted-foreground);
    margin-bottom: 2rem;
}

.hero-badge .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--secondary);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    color: var(--foreground);
}

.text-gradient {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 400;
    background: linear-gradient(135deg, #6366f1, #fb7185);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.05rem;
    color: var(--muted-foreground);
    margin-bottom: 2.5rem;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: var(--glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 1.5rem;
    padding: 2.25rem;
    border: var(--glass-border);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 100%);
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), 0 20px 40px rgba(0, 0, 0, 0.05);
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(99, 102, 241, 0.2);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.625rem;
    background: var(--foreground);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--muted-foreground);
    font-size: 0.875rem;
    line-height: 1.65;
}

/* ===== Tech Badges ===== */
.tech-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--foreground);
    transition: all 0.2s;
}

.tech-badge:hover {
    background: var(--foreground);
    color: #ffffff;
    border-color: var(--foreground);
}

/* ===== About / SRS Styles ===== */
.section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.section-text {
    color: var(--muted-foreground);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.subsection-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
    color: var(--foreground);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--muted);
}

.req-list {
    list-style: none;
    padding: 0;
}

.req-list li {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background: var(--muted);
    border-radius: 0.5rem;
    color: var(--muted-foreground);
    line-height: 1.6;
    font-size: 0.9rem;
}

.req-list li strong {
    color: var(--foreground);
}

/* ===== Tables ===== */
.table-responsive {
    overflow-x: auto;
}

.req-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.req-table th,
.req-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.req-table th {
    background: var(--muted);
    font-weight: 600;
    color: var(--foreground);
}

.req-table tr:hover td {
    background: var(--muted);
}

.req-table td {
    color: var(--muted-foreground);
}

/* ===== Footer ===== */
.footer {
    background: #ffffff;
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 4rem;
    color: var(--muted-foreground);
    font-size: 0.85rem;
}

/* ===== Utilities ===== */
.text-center {
    text-align: center;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mb-6 {
    margin-bottom: 1.5rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.mb-10 {
    margin-bottom: 2.5rem;
}

.mb-12 {
    margin-bottom: 3rem;
}

.py-20 {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

/* ===== Card ===== */
.card {
    background: #ffffff;
    border-radius: 1rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.p-6 {
    padding: 1.5rem;
}

.p-8 {
    padding: 2rem;
}

/* ===== Animations ===== */
@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-12px);
    }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.track-item-animate {
    animation: fade-in-up 0.5s ease-out forwards;
    opacity: 0;
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.animate-spin {
    animation: spin 1s linear infinite;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .nav-links {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .navbar-content {
        padding: 0 1rem;
    }

    .hero {
        margin: 1rem;
        padding: 4rem 1rem;
    }

    .orb {
        display: none;
    }
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    width: 320px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 1rem;
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.85rem;
    transform: translateX(120%);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    opacity: 0;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-icon {
    flex-shrink: 0;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-content {
    flex-grow: 1;
}

.toast-message {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--foreground);
    line-height: 1.4;
}

/* Variants */
.toast-success .toast-icon {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.toast-error .toast-icon {
    background: rgba(244, 63, 94, 0.1);
    color: var(--secondary);
}

.toast-info .toast-icon {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.toast-warning .toast-icon {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}