@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --zinc-50: #fafafa;
    --zinc-100: #f4f4f5;
    --zinc-200: #e4e4e7;
    --zinc-300: #d4d4d8;
    --zinc-400: #a1a1aa;
    --zinc-500: #71717a;
    --zinc-600: #52525b;
    --zinc-700: #3f3f46;
    --zinc-800: #27272a;
    --zinc-900: #18181b;
    --zinc-950: #09090b;

    --border-color: var(--zinc-200);

    /* Link to Berry Theme Variables */
    --brand-primary: #16595a;
    --brand-dark: var(--bs-primary-dark, #16595a); /* Fallback to emerald dark */
    --brand-soft: var(--bs-primary-light, #e4f6f6); /* Fallback to emerald soft */
    --brand-secondary: var(--bs-secondary);
    
    /* Berry Design Tokens */
    --border-radius-sm: 8px;
    --border-radius-lg: 12px;
    --card-shadow: 0 2px 14px 0 rgba(32, 40, 45, 0.08);
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--zinc-950);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
}

/* Sections */
section {
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

/* Background System */
.bg-mesh {
    background-color: #ffffff;
    background-image: 
        radial-gradient(at 0% 0%, hsla(161, 71%, 95%, 1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(161, 71%, 90%, 1) 0, transparent 50%), 
        radial-gradient(at 100% 0%, hsla(161, 71%, 95%, 1) 0, transparent 50%);
}

.bg-mesh-bottom {
    background-image: 
        radial-gradient(at 0% 100%, hsla(161, 71%, 95%, 1) 0, transparent 50%), 
        radial-gradient(at 50% 100%, hsla(161, 71%, 90%, 1) 0, transparent 50%), 
        radial-gradient(at 100% 100%, hsla(161, 71%, 95%, 1) 0, transparent 50%);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
}

.fw-extra-bold { font-weight: 800; }
.text-primary { color: var(--brand-primary) !important; }
.bg-primary { background-color: var(--brand-primary) !important; }
.border-primary { border-color: var(--brand-primary) !important; }

.text-muted {
    color: var(--zinc-500) !important;
}

/* Layout Helpers */
.max-w-700 { max-width: 700px; }
.max-w-800 { max-width: 800px; }
.bg-zinc-50 { background-color: var(--zinc-50); }

/* Buttons */
.btn-modern {
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

.btn-modern-primary {
    background-color: var(--brand-primary);
    color: #ffffff;
    border: 1px solid var(--brand-primary);
}

.btn-modern-primary:hover {
    filter: brightness(0.9);
    color: #16595a;
    border: 1px solid var(--brand-primary);
}

.btn-modern-outline {
    background-color: transparent;
    color: var(--zinc-950);
    border: 1px solid var(--zinc-200);
}

.btn-modern-outline:hover {
    background-color: var(--zinc-100);
    border-color: var(--zinc-300);
}

/* Cards */
.card-modern {
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-modern:hover {
    transform: translateY(-8px);
    border-color: var(--brand-primary);
    background-color: rgba(255, 255, 255, 0.85);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.12);
}

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background-color: var(--brand-soft);
    color: var(--brand-primary);
    margin-bottom: 1.5rem;
}

/* Hero Section */
.hero-section {
    padding: 160px 0 120px;
    background-color: transparent;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--zinc-950);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--zinc-500);
    max-width: 600px;
    line-height: 1.6;
}

@media (max-width: 991.98px) {
    .hero-title { font-size: 2.75rem; }
}

/* Stats */
.stat-item {
    padding: 3rem 0;
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--brand-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--zinc-500);
}

.accordion-item.card-modern {
    background-color: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.accordion-button {
    background: transparent !important;
    border-radius: 24px !important;
}

.accordion-button:not(.collapsed) {
    color: var(--brand-primary);
    box-shadow: none;
}

/* Helpers */
.shadow-2xl {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.skew-y-3 {
    transform: rotate(2deg);
}

.fs-huge {
    font-size: 5rem;
}

/* Badge Styles */
.badge-item {
    padding: 1rem;
    border-radius: 16px;
    background: var(--zinc-50);
    border: 1px solid var(--zinc-100);
    text-align: center;
    transition: all 0.2s ease;
}

.badge-item:hover {
    background: #ffffff;
    box-shadow: var(--card-shadow);
    transform: scale(1.05);
}

.badge-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: block;
}

/* Streak Counter */
.streak-card {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-dark));
    color: #ffffff;
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
}

.streak-card::after {
    content: '🔥';
    position: absolute;
    right: -10px;
    bottom: -10px;
    font-size: 4rem;
    opacity: 0.2;
}

.avtar.avtar-xl {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.avtar.bg-primary {
    background-color: var(--brand-primary) !important;
}

/* Footer */
footer {
    border-top: 1px solid var(--zinc-200);
    padding: 4rem 0 0;
}

/* ============================================
   MOBILE RESPONSIVE STYLES
   ============================================ */

/* Tablet & Mobile - up to 991px */
@media (max-width: 991.98px) {
    section {
        padding: 80px 0;
    }
    
    .hero-section {
        padding: 100px 0 80px;
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.15;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .card-modern {
        padding: 2rem;
    }
    
    .card-icon {
        width: 56px;
        height: 56px;
    }
}

/* Mobile - up to 767px */
@media (max-width: 767.98px) {
    section {
        padding: 60px 0;
    }
    
    .hero-section {
        padding: 80px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
        margin-bottom: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        line-height: 1.5;
        max-width: 100%;
    }
    
    /* Compact cards for mobile */
    .card-modern {
        padding: 1.5rem;
        border-radius: 20px;
    }
    
    .card-modern:hover {
        transform: translateY(-4px);
    }
    
    .card-icon {
        width: 48px;
        height: 48px;
        margin-bottom: 1rem;
    }
    
    .card-icon i {
        font-size: 1.5rem !important;
    }
    
    /* Stats mobile */
    .stat-value {
        font-size: 2rem;
    }
    
    .stat-item {
        padding: 2rem 0;
    }
    
    /* Tutorial section - remove scale on mobile */
    .highlight-card {
        transform: none !important;
    }
    
    /* FAQ accordion */
    .accordion-button {
        font-size: 1rem !important;
        padding: 1rem 1.25rem !important;
    }
    
    .accordion-body {
        padding: 0 1.25rem 1rem !important;
    }
    
    /* Reduce section heading sizes */
    h2.display-6 {
        font-size: 1.75rem;
    }
    
    /* Mobile mockup card styles */
    .mobile-mockup-card {
        max-width: 320px;
        margin: 2rem auto 0;
    }
    
    .mobile-mockup-card .card-modern {
        padding: 1.25rem;
    }
    
    .mobile-mockup-card .streak-card {
        padding: 1rem;
    }
    
    .mobile-mockup-card .streak-card .display-5 {
        font-size: 1.5rem;
    }
    
    .mobile-mockup-card .badge-item {
        padding: 0.75rem;
    }
    
    .mobile-mockup-card .badge-icon {
        font-size: 1.5rem;
    }
    
    /* Footer */
    footer {
        padding: 3rem 0 0;
    }
    
    /* Badge section spacing */
    #info .row.g-4 {
        --bs-gutter-y: 1rem;
    }
}

/* Small Mobile - up to 575px */
@media (max-width: 575.98px) {
    /* Full width buttons on mobile */
    .btn-lg {
        width: 100%;
        padding: 0.875rem 1.5rem !important;
    }
    
    /* Hero badge smaller */
    .hero-section .badge {
        font-size: 0.7rem;
        padding: 0.4rem 0.75rem !important;
    }
    
    /* Typography adjustments */
    .hero-title {
        font-size: 1.875rem;
    }
    
    /* Card spacing */
    .card-modern {
        padding: 1.25rem;
    }
    
    /* Section headings */
    h2.display-6 {
        font-size: 1.5rem;
    }
    
    /* Quote section */
    section.bg-primary h3 {
        font-size: 1.25rem !important;
    }
    
    .fs-huge {
        font-size: 3rem;
    }
    
    /* CTA section */
    section .display-5 {
        font-size: 1.5rem !important;
    }
    
    /* Navigation adjustments */
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    .navbar-brand img {
        width: 28px;
        height: 28px;
    }
    
    /* Tutorial avtar smaller */
    .avtar.avtar-xl {
        width: 60px;
        height: 60px;
        font-size: 1.5rem !important;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .card-modern:hover {
        transform: none;
    }
    
    .badge-item:hover {
        transform: none;
    }
    
    .btn-modern:active {
        transform: scale(0.98);
    }
}

/* Safe area for notched devices */
@supports (padding: max(0px)) {
    footer {
        padding-bottom: max(1rem, env(safe-area-inset-bottom));
    }
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

/* Fade in animation for sections */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    will-change: opacity, transform;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: none;
}

/* Stagger delay for child elements */
.fade-in-section .stagger-1 { transition-delay: 0.1s; }
.fade-in-section .stagger-2 { transition-delay: 0.2s; }
.fade-in-section .stagger-3 { transition-delay: 0.3s; }

/* Disable animations for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    .fade-in-section {
        opacity: 1;
        transform: none;
        transition: none;
    }
    
    .card-modern,
    .btn-modern {
        transition: none;
    }
}