:root {
    --font-size-min: 16;
    --font-size-max: 20;
    --font-ratio-min: 1.2;
    --font-ratio-max: 1.33;
    --font-width-min: 375;
    --font-width-max: 1500;

    /* Portfolio specific variables */
    --gap: 8px;
    --base: clamp(2rem, 8cqi, 80px);
    --easing: linear(
        0 0%,
        0.1538 4.09%,
        0.2926 8.29%,
        0.4173 12.63%,
        0.5282 17.12%,
        0.6255 21.77%,
        0.7099 26.61%,
        0.782 31.67%,
        0.8425 37%,
        0.8887 42.23%,
        0.9257 47.79%,
        0.9543 53.78%,
        0.9752 60.32%,
        0.9883 67.11%,
        0.9961 75%,
        1 100%
    );
    --speed: 0.6s;
}

html {
    color-scheme: light dark;
    scroll-behavior: smooth;
}

* {
    box-sizing: border-box;
}

body {
    background: light-dark(#fff, #000);
    color: light-dark(#000, #fff);
    margin: 0;
    font-family:
        "SF Pro Text", "SF Pro Icons", "AOS Icons", "Helvetica Neue",
        Helvetica, Arial, sans-serif, system-ui;
    line-height: 1.6;
}

.background-grid {
    --size: 45px;
    --line: color-mix(in hsl, canvasText, transparent 70%);
    position: fixed;
    inset: 0;
    background:
        linear-gradient(90deg, var(--line) 1px, transparent 1px var(--size))
            50% 50% / var(--size) var(--size),
        linear-gradient(var(--line) 1px, transparent 1px var(--size)) 50%
            50% / var(--size) var(--size);
    mask: linear-gradient(-20deg, transparent 50%, white);
    pointer-events: none;
    z-index: -1;
}

.portfolio-container {
    position: relative;
    z-index: 1;
}

/* Navigation */
.portfolio-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: color-mix(in hsl, canvas, transparent 10%);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid color-mix(in hsl, canvasText, transparent 90%);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--speed) var(--easing);
}

.portfolio-nav.visible {
    transform: translateY(0);
    opacity: 1;
}

.nav-home {
    font-size: 1.25rem;
    font-weight: 600;
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.nav-home:hover {
    opacity: 0.8;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    opacity: 0;
    animation: fadeInNav 0.5s ease forwards;
    transition: opacity 0.2s ease;
}

.nav-links a:nth-child(1) {
    animation-delay: 0.1s;
}
.nav-links a:nth-child(2) {
    animation-delay: 0.2s;
}
.nav-links a:nth-child(3) {
    animation-delay: 0.3s;
}
.nav-links a:nth-child(4) {
    animation-delay: 0.4s;
}

.nav-links a:hover {
    opacity: 0.7;
}

.main-content {
    padding-top: 6rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
}

.container {
    text-align: center;
    padding: 2rem;
    width: 100%;
    max-width: 1200px;
    box-sizing: border-box;
    padding-left: max(2rem, env(safe-area-inset-left));
    padding-right: max(2rem, env(safe-area-inset-right));
}

h1 {
    --font-size-min: 22;
    --font-level: 3;
    --fluid-min: calc(
        var(--font-size-min) *
            pow(var(--font-ratio-min), var(--font-level, 0))
    );
    --fluid-max: calc(
        var(--font-size-max) *
            pow(var(--font-ratio-max), var(--font-level, 0))
    );
    --fluid-preferred: calc(
        (var(--fluid-max) - var(--fluid-min)) /
            (var(--font-width-max) - var(--font-width-min))
    );
    --fluid-type: clamp(
        (var(--fluid-min) / 16) * 1rem,
        ((var(--fluid-min) / 16) * 1rem) -
            (
                ((var(--fluid-preferred) * var(--font-width-min)) / 16) *
                    1rem
            ) +
            (var(--fluid-preferred) * var(--variable-unit, 100vi)),
        (var(--fluid-max) / 16) * 1rem
    );
    font-size: var(--fluid-type);
    margin: 0 0 2rem 0;
    font-weight: bold;
    color: light-dark(#000, #fff);
}

#canvas {
    border: 1px solid light-dark(rgba(0, 0, 0, 0.2), rgba(255, 255, 255, 0.2));
    border-radius: 12px;
    background: light-dark(#fafafa, #111);
    display: block;
    margin: 0 auto 2rem;
    width: 100%;
    max-width: min(90vw, 800px);
    height: auto;
    aspect-ratio: 4/3;
    box-shadow: 0 4px 12px light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.05));
}

.controls {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.control-group {
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    color: light-dark(#333, #ccc);
    font-weight: 600;
    font-size: 0.9rem;
    text-align: left;
}

.control-group select {
    background: light-dark(#fff, #222);
    color: light-dark(#000, #fff);
    border: 1px solid light-dark(rgba(0, 0, 0, 0.2), rgba(255, 255, 255, 0.2));
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.control-group select:focus {
    outline: none;
    border-color: light-dark(#007AFF, #0A84FF);
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.1));
    border-radius: 3px;
    outline: none;
    transition: background 0.3s ease;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: light-dark(#007AFF, #0A84FF);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: light-dark(#007AFF, #0A84FF);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform 0.2s ease;
}

.control-group input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
}

button {
    background: linear-gradient(
        135deg,
        color-mix(in hsl, canvasText, transparent 85%),
        color-mix(in hsl, canvasText, transparent 90%)
    );
    border: 1px solid color-mix(in hsl, canvasText, transparent 70%);
    color: light-dark(#000, #fff);
    padding: 0.875rem 1.75rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-family: inherit;
    font-weight: 600;
    min-height: 44px;
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
    transition: all 0.3s var(--easing);
    box-shadow: 0 2px 8px color-mix(in hsl, canvasText, transparent 90%);
}

button::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        color-mix(in hsl, canvasText, transparent 85%),
        transparent
    );
    transition: left 0.5s ease;
}

button:hover::before {
    left: 100%;
}

button:hover {
    background: linear-gradient(
        135deg,
        color-mix(in hsl, canvasText, transparent 80%),
        color-mix(in hsl, canvasText, transparent 85%)
    );
    transform: translateY(-2px);
    box-shadow: 0 4px 16px color-mix(in hsl, canvasText, transparent 80%);
    border-color: color-mix(in hsl, canvasText, transparent 60%);
}

button:disabled {
    background: color-mix(in hsl, canvasText, transparent 85%);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

button:disabled::before {
    display: none;
}

button span {
    position: relative;
    z-index: 1;
}

#play-pause-btn {
    background: linear-gradient(135deg, #FF6B6B, #FF5252);
    border-color: #FF6B6B;
    color: white;
}

#play-pause-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #FF5252, #FF4444);
    border-color: #FF5252;
}

#play-pause-btn:disabled {
    background: color-mix(in hsl, canvasText, transparent 85%);
    color: light-dark(#666, #999);
    border-color: color-mix(in hsl, canvasText, transparent 70%);
}

.value-display {
    font-weight: 600;
    color: light-dark(#007AFF, #0A84FF);
}

/* Mobile-specific styles */
@media (max-width: 768px) {
    .portfolio-nav {
        padding: 0.75rem 1rem;
    }
    
    .nav-links {
        gap: 0.5rem;
    }
    
    .nav-links a {
        padding: 0.375rem 0.75rem;
        font-size: 0.9rem;
    }
    
    .container {
        padding: 1rem;
    }
    
    #canvas {
        max-width: 95vw;
        margin: 0 auto 1.5rem;
    }
    
    .controls {
        gap: 1.25rem;
    }
    
    .button-group {
        flex-direction: column;
        align-items: center;
    }
    
    button {
        padding: 1rem 2rem;
        width: 100%;
        max-width: 300px;
    }
    
    .control-group input[type="range"] {
        height: 8px;
    }
    
    .control-group input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }
    
    .control-group input[type="range"]::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 480px) {
    .portfolio-nav {
        padding: 0.5rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav-home {
        font-size: 1rem;
    }
    
    .container {
        padding: 0.5rem;
    }
    
    #canvas {
        max-width: 98vw;
        border-width: 1px;
    }
    
    .controls {
        gap: 1rem;
    }
    
    button {
        padding: 1.125rem 2.25rem;
        font-size: 1rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .background-grid {
        animation: none;
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}