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

:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #0891b2;
    --text-color: #1f2937;
    --background-color: #ffffff;
    --surface-color: #f9fafb;
    --border-color: #e5e7eb;
    --error-color: #dc2626;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Merriweather', Georgia, serif;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;

    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

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

body {
    font-family: var(--font-primary, sans-serif);
    color: var(--text-color, #1f2937);
    background-color: var(--background-color, #ffffff);
    line-height: 1.6;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

header {
    background: linear-gradient(135deg,
        var(--primary-color, #2563eb) 0%,
        var(--secondary-color, #7c3aed) 100%);
    color: white;
    padding: var(--spacing-lg, 1.5rem) var(--spacing-xl, 2rem);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);

    & h1 {
        font-size: clamp(1.5rem, 5vw, 2.5rem);
        margin-bottom: var(--spacing-md, 1rem);
        font-weight: 700;
        letter-spacing: -0.02em;
    }

    & nav {
        & ul {
            display: flex;
            list-style: none;
            gap: var(--spacing-md, 1rem);
            flex-wrap: wrap;

            & li {
                & a {
                    color: white;
                    text-decoration: none;
                    padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
                    border-radius: var(--radius-md, 0.5rem);
                    transition: all var(--transition-normal, 300ms);
                    display: inline-block;

                    &:hover {
                        background-color: rgba(255, 255, 255, 0.2);
                        transform: translateY(-2px);
                    }

                    &:active {
                        transform: translateY(0);
                    }
                }
            }
        }
    }
}

main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl, 2rem);

    & > section {
        margin-bottom: var(--spacing-2xl, 3rem);

        &:has(article) {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
            gap: var(--spacing-lg, 1.5rem);
        }
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

section {
    animation: fadeInUp var(--transition-slow, 500ms) ease-out;
    animation-fill-mode: both;

    &:nth-child(1) { animation-delay: 0ms; }
    &:nth-child(2) { animation-delay: 100ms; }
    &:nth-child(3) { animation-delay: 200ms; }
}

article {
    background: var(--surface-color, #f9fafb);
    padding: var(--spacing-lg, 1.5rem);
    border-radius: var(--radius-lg, 1rem);
    border: 1px solid var(--border-color, #e5e7eb);
    transition: all var(--transition-normal, 300ms);

    &:hover {
        transform: translateY(-4px) scale(1.02);
        box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
        border-color: var(--primary-color, #2563eb);
    }

    & h2, & h3 {
        color: var(--primary-color, #2563eb);
        margin-bottom: var(--spacing-sm, 0.5rem);
        font-family: var(--font-secondary, serif);
    }

    & img {
        width: 100%;
        height: auto;
        border-radius: var(--radius-md, 0.5rem);
        margin: var(--spacing-md, 1rem) 0;
        transition: transform var(--transition-normal, 300ms);

        &:hover {
            transform: scale(1.05);
        }
    }
}

project-card {
    display: block;

    & article {
        height: 100%;
    }
}

button, input[type="submit"] {
    background: color-mix(in srgb, var(--primary-color, #2563eb) 90%, white);
    color: white;
    border: none;
    padding: var(--spacing-sm, 0.5rem) var(--spacing-lg, 1.5rem);
    border-radius: var(--radius-md, 0.5rem);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal, 300ms);
    font-family: var(--font-primary, sans-serif);

    &:hover {
        background: color-mix(in srgb, var(--primary-color, #2563eb) 100%, black 10%);
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    }

    &:active {
        transform: translateY(0);
    }
}

section:has(form) {
    background: var(--surface-color, #f9fafb);
    padding: var(--spacing-xl, 2rem);
    border-radius: var(--radius-lg, 1rem);
    border: 2px solid var(--border-color, #e5e7eb);
}

nav:has(a:hover) {
    ul li a:not(:hover) {
        opacity: 0.7;
    }
}

article:has(img) {
    padding: var(--spacing-xl, 2rem);
}

form {
    max-width: 600px;

    & fieldset {
        border: 2px solid var(--border-color, #e5e7eb);
        border-radius: var(--radius-md, 0.5rem);
        padding: var(--spacing-lg, 1.5rem);

        & legend {
            font-weight: 700;
            color: var(--primary-color, #2563eb);
            padding: 0 var(--spacing-sm, 0.5rem);
            font-size: 1.25rem;
        }

        & label {
            display: inline-block;
            margin-bottom: var(--spacing-xs, 0.25rem);
            font-weight: 600;
            color: var(--text-color, #1f2937);
        }

        & input[type="text"],
        & input[type="email"],
        & textarea {
            width: 100%;
            padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
            border: 2px solid var(--border-color, #e5e7eb);
            border-radius: var(--radius-sm, 0.25rem);
            font-family: var(--font-primary, sans-serif);
            font-size: 1rem;
            transition: all var(--transition-fast, 150ms);

            &:focus {
                outline: none;
                border-color: var(--primary-color, #2563eb);
                box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
            }
        }
    }
}

footer {
    background: var(--text-color, #1f2937);
    color: white;
    text-align: center;
    padding: var(--spacing-xl, 2rem);
    margin-top: auto;

    & a {
        color: var(--accent-color, #0891b2);
        text-decoration: none;
        transition: color var(--transition-fast, 150ms);

        &:hover {
            color: color-mix(in srgb, var(--accent-color, #0891b2) 80%, white 20%);
            text-decoration: underline;
        }
    }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary, serif);
    line-height: 1.2;
    margin-bottom: var(--spacing-md, 1rem);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: var(--spacing-md, 1rem);
}

ul, ol {
    margin-left: var(--spacing-lg, 1.5rem);
    margin-bottom: var(--spacing-md, 1rem);

    & li {
        margin-bottom: var(--spacing-sm, 0.5rem);
    }
}

@starting-style {
    dialog[open] {
        opacity: 0;
        transform: scale(0.9);
    }
}

dialog {
    border: none;
    border-radius: var(--radius-lg, 1rem);
    padding: var(--spacing-xl, 2rem);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: opacity var(--transition-normal, 300ms),
                transform var(--transition-normal, 300ms),
                overlay var(--transition-normal, 300ms) allow-discrete,
                display var(--transition-normal, 300ms) allow-discrete;

    &[open] {
        opacity: 1;
        transform: scale(1);
    }

    &::backdrop {
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(4px);
    }
}

canvas {
    display: block;
    margin: var(--spacing-md, 1rem) 0;
}

progress {
    width: 100%;
    height: 1.5rem;
    border-radius: var(--radius-sm, 0.25rem);
}

svg {
    margin: var(--spacing-md, 1rem) 0;
}

iframe {
    border: 2px solid var(--border-color, #e5e7eb);
    border-radius: var(--radius-md, 0.5rem);
    margin: var(--spacing-md, 1rem) 0;
}

template {
    display: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm, 0.5rem);
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: white;
    margin: 5px 0;
    transition: all var(--transition-normal, 300ms);
}

@media (max-width: 640px) {
    :root {
        --spacing-xl: 1rem;
        --spacing-2xl: 1.5rem;
    }

    body {
        width: 100dvw;
        overflow-x: hidden;
    }

    header {
        padding: var(--spacing-md, 1rem);

        & h1 {
            font-size: 1.5rem;
        }

        & nav {
            & ul {
                flex-direction: column;
                gap: var(--spacing-sm, 0.5rem);
                max-height: 0;
                overflow: hidden;
                transition: max-height var(--transition-normal, 300ms);

                &.active {
                    max-height: 500px;
                }

                & li {
                    width: 100%;

                    & a {
                        display: block;
                        width: 100%;
                        text-align: center;
                        padding: var(--spacing-md, 1rem);
                    }
                }
            }
        }
    }

    .nav-toggle {
        display: block;
    }

    main {
        padding: var(--spacing-md, 1rem);

        & > section {
            &:has(article) {
                grid-template-columns: 1fr;
            }
        }
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    article {
        padding: var(--spacing-md, 1rem);

        &:has(img) {
            padding: var(--spacing-md, 1rem);
        }
    }
}

@media (min-width: 641px) and (max-width: 1024px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    header {
        & nav ul {
            gap: var(--spacing-sm, 0.5rem);
        }
    }

    main {
        padding: var(--spacing-lg, 1.5rem);

        & > section {
            &:has(article) {
                grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            }
        }
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.35rem; }
}

@media (min-width: 1025px) {
    main {
        & > section {
            &:has(article) {
                grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            }
        }
    }

    article {
        &:hover {
            transform: translateY(-8px) scale(1.03);
        }
    }
}

@media print {
    header nav,
    footer,
    button {
        display: none;
    }

    body {
        color: black;
        background: white;
    }

    a {
        text-decoration: underline;
        color: black;
    }

    article {
        page-break-inside: avoid;
        border: 1px solid black;
    }
}

@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --text-color: #000000;
        --background-color: #ffffff;
        --border-color: #000000;
    }

    article, form fieldset {
        border-width: 2px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}