:root {
    --spacing-unit: 2rem;
    --container-width: 900px;
}

html[data-theme='light'] {
    --bg-color: #f8f9fa;
    --text-color: #1a1a1a;
    --text-secondary: #555555;
    --accent-color: #000000;
    --border-color: #e0e0e0;
    --card-bg: #fff;
    --overlay-start: rgba(248, 249, 250, 0.4);
    --overlay-end: rgba(248, 249, 250, 0.8);
}

html[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --text-color: #f8f9fa;
    --text-secondary: #aaaaaa;
    --accent-color: #ffffff;
    --border-color: #444444;
    --card-bg: #2c2c2c;
    --overlay-start: rgba(26, 26, 26, 0.4);
    --overlay-end: rgba(26, 26, 26, 0.9);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.video-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

#bg-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    visibility: hidden;
    position: absolute;
}

#bg-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.video-settings-btn {
    position: fixed;
    bottom: 10px;
    left: 10px;
    z-index: 3;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.45rem 0.7rem;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.video-settings-btn:hover {
    color: var(--text-color);
    border-color: var(--accent-color);
}

.video-controls[hidden] {
    display: none !important;
}

.video-controls {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    width: min(42rem, calc(100vw - 3rem));
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
    padding: 0.75rem 0.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 11px;
    pointer-events: auto;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 4px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.video-controls > div {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.video-controls label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.5);
    font-size: 9px;
    font-weight: 600;
}

.video-controls .value {
    color: rgba(255, 255, 255, 0.85);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0;
}

.video-controls input[type="range"] {
    width: 100%;
    margin: 0;
    appearance: none;
    -webkit-appearance: none;
    background: transparent;
    height: 18px;
    cursor: pointer;
}

.video-controls input[type="range"]:focus {
    outline: none;
}

.video-controls input[type="range"]::-webkit-slider-runnable-track {
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 0;
}

.video-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 4px;
    height: 4px;
    border: 0;
    border-radius: 0;
    background: #fff;
    margin-top: -1.5px;
}

.video-controls input[type="range"]::-moz-range-track {
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    border: 0;
    border-radius: 0;
}

.video-controls input[type="range"]::-moz-range-thumb {
    width: 4px;
    height: 4px;
    border: 0;
    border-radius: 0;
    background: #fff;
}

.gradient-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(0, 0, 0, 0.45) 0%, rgba(0, 0, 0, 1) 100%);
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 4rem 2rem;
    position: relative;
    z-index: 1;
    width: 100%;
}

a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid var(--text-secondary);
    transition: all 0.2s ease;
}

a:hover {
    border-bottom: 2px solid var(--accent-color);
    color: var(--accent-color);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 626px;
}

header {
    margin-bottom: 4rem;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.contact-info span {
    display: inline-flex;
    align-items: center;
}

.contact-info a {
    font-weight: 600;
}

@media (max-width: 768px) {
    .container {
        padding: 2rem 1.5rem;
    }

    h1 {
        font-size: 2.5rem;
    }

    .video-controls {
        width: calc(100vw - 2rem);
        bottom: 1rem;
        grid-template-columns: 1fr 1fr;
        gap: 1rem 1.25rem;
    }
}

@media (max-width: 520px) {
    .video-controls {
        bottom: 1rem;
        grid-template-columns: 1fr;
    }
}

.fade-in {
    animation: fadeIn 1.5s ease-out forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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