/* ===== CSS Variables ===== */
:root {
    --color-black: #0a0a0a;
    --color-dark: #14110f;
    --color-charcoal: #1c1917;
    --color-brown-dark: #3e2723;
    --color-brown: #5d4037;
    --color-brown-light: #8d6e63;
    --color-brown-pale: #bcaaa4;
    --color-cream: #efebe9;
    --color-white: #faf9f7;
    --color-gold: #c9a96e;
    --color-gold-dim: #8b7355;

    --font-main: 'Tajawal', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-main);
    background: var(--color-black);
    color: var(--color-cream);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    position: relative;
}

/* ===== Grain Overlay ===== */
.grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 200px 200px;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--color-cream);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    transition: color 0.3s var(--transition-smooth);
}

.logo:hover {
    color: var(--color-gold);
}

.logo-icon {
    color: var(--color-gold);
    font-size: 1.2rem;
}

/* ===== Main Layout ===== */
.main {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 6rem 2rem 4rem;
}

.canvas-container {
    position: absolute;
    inset: 0;
    z-index: 0;
}

#three-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ===== Content ===== */
.content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 700px;
    padding: 3rem;
    background: rgba(10, 10, 10, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(201, 169, 110, 0.1);
    border-radius: 24px;
    box-shadow: 
        0 25px 80px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.03);
    animation: fadeInUp 1s var(--transition-smooth) forwards;
    opacity: 0;
    transform: translateY(30px);
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Error Code ===== */
.error-code {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    font-weight: 900;
    line-height: 1;
}

.digit {
    font-size: clamp(5rem, 12vw, 9rem);
    color: transparent;
    -webkit-text-stroke: 2px var(--color-gold-dim);
    background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-brown-light) 50%, var(--color-brown-dark) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    opacity: 0;
    transform: translateY(40px) scale(0.8);
    animation: digitReveal 0.8s var(--transition-smooth) forwards;
    text-shadow: 0 0 60px rgba(201, 169, 110, 0.15);
}

.digit:nth-child(2) {
    color: var(--color-gold);
    -webkit-text-stroke: 0;
    text-shadow: 0 0 80px rgba(201, 169, 110, 0.3);
}

@keyframes digitReveal {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===== Divider ===== */
.divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1.5rem 0;
    opacity: 0;
    animation: fadeIn 1s 0.6s var(--transition-smooth) forwards;
}

.divider-line {
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gold-dim), transparent);
}

.divider-icon {
    color: var(--color-gold);
    font-size: 0.8rem;
    opacity: 0.6;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* ===== Title & Description ===== */
.title {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1rem;
    letter-spacing: 1px;
    opacity: 0;
    animation: fadeInUp 0.8s 0.4s var(--transition-smooth) forwards;
}

.description {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    color: var(--color-brown-pale);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    opacity: 0;
    animation: fadeInUp 0.8s 0.6s var(--transition-smooth) forwards;
}

/* ===== Buttons ===== */
.actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s 0.8s var(--transition-smooth) forwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.9rem 2rem;
    border-radius: 12px;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.4s var(--transition-smooth);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
    transform: translateX(-100%);
    transition: transform 0.6s var(--transition-smooth);
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-brown-dark), var(--color-brown));
    color: var(--color-white);
    box-shadow: 0 4px 20px rgba(93, 64, 55, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(93, 64, 55, 0.4);
    background: linear-gradient(135deg, var(--color-brown), var(--color-brown-light));
}

.btn-secondary {
    background: transparent;
    color: var(--color-brown-pale);
    border: 1px solid rgba(201, 169, 110, 0.2);
}

.btn-secondary:hover {
    border-color: var(--color-gold);
    color: var(--color-gold);
    background: rgba(201, 169, 110, 0.05);
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.1rem;
    transition: transform 0.3s var(--transition-smooth);
}

.btn:hover .btn-icon {
    transform: translateX(-3px);
}

/* ===== Footer ===== */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-brown-pale);
    opacity: 0.4;
    z-index: 10;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .nav {
        padding: 1rem 1.5rem;
    }

    .content {
        padding: 2rem 1.5rem;
        margin: 0 0.5rem;
    }

    .actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .digit {
        -webkit-text-stroke: 1.5px var(--color-gold-dim);
    }
}

/* ===== Cursor Glow ===== */
.cursor-glow {
    position: fixed;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(201, 169, 110, 0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 5;
    transform: translate(-50%, -50%);
    transition: opacity 0.3s;
}