@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=SF+Pro+Display:wght@700&display=swap');

:root {
    --bg-base: #F5F5F7;
    --bg-card: #FFFFFF;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --accent: #0066CC;
    --border: rgba(0, 0, 0, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: 1px solid rgba(0, 0, 0, 0.05);
    --clay-shadow: 
        inset 0 1px 0 rgba(255,255,255,0.9),
        inset 0 -1px 0 rgba(0,0,0,0.04),
        0 8px 32px rgba(0,0,0,0.08),
        0 2px 8px rgba(0,0,0,0.04);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-tech: 'Inter', sans-serif;
    --shadow-soft: 0 2px 20px rgba(0,0,0,0.06);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.08);
    --radius: 18px;
}

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

html {
    scroll-behavior: smooth;
    font-family: var(--font-primary);
    background-color: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: var(--glass-border);
    box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-area img {
    height: 38px;
    width: auto;
    display: block;
}

.brand-name {
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.logo-area:hover .brand-name {
    color: var(--accent);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: -0.1px;
    position: relative;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    cursor: pointer;
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 12px;
    z-index: 1100;
    flex-shrink: 0;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
}

.hamburger:hover {
    background: var(--bg-base);
    box-shadow: var(--shadow-card);
}

.hamburger span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.35s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.25s ease,
                width 0.3s ease;
    transform-origin: center;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
    width: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.35s ease;
}

.nav-overlay.active {
    opacity: 1;
}

.glass-card {
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--clay-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: 
        inset 0 1px 0 rgba(255,255,255,0.9),
        0 16px 48px rgba(0,0,0,0.12),
        0 4px 12px rgba(0,0,0,0.06);
}

footer {
    margin-top: auto;
    background: var(--bg-card);
    border-top: var(--glass-border);
    padding: 3rem 2rem 1.5rem 2rem;
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-overlay {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: min(300px, 80vw);
        height: 100dvh;
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        gap: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        border-left: var(--glass-border);
        padding: 90px 1.25rem 2rem;
        z-index: 999;
        transform: translateX(110%);
        transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
        overflow-y: auto;
        box-shadow: -16px 0 40px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-menu::before {
        content: 'NAVIGATION';
        display: block;
        font-size: 0.6rem;
        font-weight: 700;
        letter-spacing: 3px;
        color: var(--text-secondary);
        padding: 0 0.75rem 1rem;
        border-bottom: 1px solid var(--border);
        margin-bottom: 0.75rem;
    }

    .nav-menu li {
        opacity: 0;
        transform: translateX(18px);
        transition: opacity 0.3s ease, transform 0.3s ease;
    }

    .nav-menu.active li { opacity: 1; transform: translateX(0); }
    .nav-menu.active li:nth-child(1) { transition-delay: 0.07s; }
    .nav-menu.active li:nth-child(2) { transition-delay: 0.12s; }
    .nav-menu.active li:nth-child(3) { transition-delay: 0.17s; }
    .nav-menu.active li:nth-child(4) { transition-delay: 0.21s; }
    .nav-menu.active li:nth-child(5) { transition-delay: 0.25s; }
    .nav-menu.active li:nth-child(6) { transition-delay: 0.29s; }
    .nav-menu.active li:nth-child(7) { transition-delay: 0.33s; }

    .nav-link {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 1rem;
        font-weight: 500;
        color: var(--text-secondary);
        padding: 0.8rem 0.75rem;
        border-radius: 10px;
        border: 1px solid transparent;
        margin-bottom: 4px;
        transition: all 0.25s ease;
    }

    .nav-link::after {
        display: none;
    }

    .nav-link:hover,
    .nav-link.active {
        color: var(--accent);
        background: rgba(0, 102, 204, 0.06);
        border-color: rgba(0, 102, 204, 0.12);
    }
}

@media (max-width: 480px) {
    .brand-name {
        font-size: 0.95rem;
    }
    .nav-container {
        padding: 0.85rem 1.25rem;
    }
}

/* ==========================================
   Extended System: Production 404 & UI Utilities
   ========================================== */
.apple-glass-card {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: var(--glass-border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.03);
}

.apple-icon-frame {
    background-color: var(--bg-card);
    border: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

/* 404 Button Color Fix */
.apple-glass-card .btn-primary {
    background-color: #1D1D1F;
    color: #FFFFFF;
    -webkit-text-fill-color: #FFFFFF;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.apple-glass-card .btn-primary:hover {
    background-color: #000000;
    color: #FFFFFF;
    -webkit-text-fill-color: #FFFFFF;
}

.apple-glass-card .btn-secondary {
    background-color: rgba(255, 255, 255, 0.8);
    color: #1D1D1F;
    -webkit-text-fill-color: #1D1D1F;
    border: 1px solid rgba(0, 0, 0, 0.1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-family: var(--font-primary);
}

.apple-glass-card .btn-secondary:hover {
    background-color: #FFFFFF;
    color: #1D1D1F;
    -webkit-text-fill-color: #1D1D1F;
}

.apple-glass-card .link-accent {
    color: var(--accent);
    -webkit-text-fill-color: var(--accent);
    font-size: 0.75rem;
    font-weight: 500;
}

.apple-glass-card .link-accent:hover {
    text-decoration: underline;
}

/* ==========================================
   Mobile Responsive Optimizations for 404
   ========================================== */
@media (max-width: 640px) {
    body {
        justify-content: center;
        padding: 1.5rem 1rem !important;
    }

    .apple-glass-card {
        padding: 2.5rem 1.5rem !important;
        border-radius: 24px !important;
        width: 100% !important;
        max-width: 100% !important;
        box-shadow: 0 12px 28px rgba(0, 0, 0, 0.04) !important;
    }

    .apple-glass-card h1 {
        font-size: 1.85rem !important;
        line-height: 1.25 !important;
        letter-spacing: -0.5px !important;
    }

    .apple-glass-card p {
        font-size: 0.925rem !important;
        line-height: 1.5 !important;
        margin-bottom: 2rem !important;
        padding: 0 0.25rem;
    }

    .apple-icon-frame {
        width: 4rem !important;
        height: 4rem !important;
        margin-bottom: 1.5rem !important;
    }

    .apple-icon-frame i {
        font-size: 1.5rem !important;
    }

    .apple-glass-card .flex {
        flex-direction: column !important;
        gap: 0.75rem !important;
        width: 100% !important;
    }

    .apple-glass-card .btn-primary,
    .apple-glass-card .btn-secondary {
        width: 100% !important;
        padding: 12px 20px !important;
        font-size: 0.875rem !important;
    }

    .apple-glass-card .mt-12 {
        margin-top: 2rem !important;
    }
}