/* style.css */
:root {
    --font-sans: 'Vazirmatn', 'Segoe UI', system-ui, -apple-system, sans-serif;

    /* رنگ‌های اصلی */
    --bg: #f8fafc;
    --bg-secondary: #ffffff;
    --text: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-dark: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.12);
    --accent-contrast: #ffffff;
    --accent-gradient: linear-gradient(135deg, var(--accent), var(--accent-light));
    --grid-dot: rgba(15, 23, 42, 0.05);

    /* نوار ناوبری */
    --nav-bg: rgba(255, 255, 255, 0.72);
    --nav-border: rgba(255, 255, 255, 0.2);
    --nav-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
    --nav-shadow-scrolled: 0 8px 40px rgba(15, 23, 42, 0.12);

    /* دکمه تغییر تم */
    --toggle-bg: rgba(15, 23, 42, 0.04);
    --toggle-bg-hover: rgba(15, 23, 42, 0.08);

    /* کارت‌ها */
    --card-bg: #ffffff;
    --card-border: rgba(15, 23, 42, 0.06);
    --card-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
    --card-shadow-hover: 0 12px 48px rgba(15, 23, 42, 0.10);

    /* ترنزیشن */
    --transition-fast: 0.15s ease;
    --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    /* رادیوس */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
}

:root[data-theme="dark"] {
    --bg: #0b1120;
    --bg-secondary: rgba(255, 255, 255, 0.02);
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent: #818cf8;
    --accent-light: #a5b4fc;
    --accent-dark: #6366f1;
    --accent-glow: rgba(129, 140, 248, 0.10);
    --accent-contrast: #0b1120;
    --accent-gradient: linear-gradient(135deg, var(--accent), var(--accent-light));
    --grid-dot: rgba(255, 255, 255, 0.045);

    --nav-bg: rgba(17, 25, 40, 0.78);
    --nav-border: rgba(255, 255, 255, 0.05);
    --nav-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --nav-shadow-scrolled: 0 8px 48px rgba(0, 0, 0, 0.45);

    --toggle-bg: rgba(255, 255, 255, 0.05);
    --toggle-bg-hover: rgba(255, 255, 255, 0.10);

    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.06);
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    --card-shadow-hover: 0 12px 56px rgba(0, 0, 0, 0.35);
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    line-height: 1.6;
    transition: color var(--transition-base);
}

/* پس‌زمینه‌ی یکدست و ثابت برای کل سایت: شبکه‌ی نقطه‌ای + دو هاله‌ی نرم رنگ اکسنت.
   با position: fixed (نه background-attachment) یک لایه‌ی سبک و مستقل از اسکرول است. */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background-color: var(--bg);
    background-image:
        radial-gradient(ellipse 640px 520px at 88% -8%, var(--accent-glow), transparent 62%),
        radial-gradient(ellipse 520px 480px at -8% 70%, var(--accent-glow), transparent 62%),
        radial-gradient(circle, var(--grid-dot) 1px, transparent 1px);
    background-size: auto, auto, 26px 26px;
    transition: background-color var(--transition-base);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-light);
}

/* ==================== Skip link ==================== */
.skip-link {
    position: absolute;
    top: -60px;
    right: 16px;
    background: var(--accent);
    color: var(--accent-contrast);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    z-index: 2000;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 16px;
}

/* ==================== Navbar ==================== */
.navbar {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 1200px;
    background-color: var(--nav-bg);
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    padding: 12px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: var(--radius-lg);
    box-shadow: var(--nav-shadow);
    border: 1px solid var(--nav-border);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.is-scrolled {
    padding: 10px 28px;
    box-shadow: var(--nav-shadow-scrolled);
    top: 14px;
    border-color: var(--accent-glow);
}

.navbar-brand {
    order: 2;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.3px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    color: var(--text);
    transition: color var(--transition-fast);
    direction: ltr;
    unicode-bidi: isolate;
}

.brand-dot {
    color: var(--accent);
    transition: color var(--transition-fast);
}

.nav-menu {
    order: 3;
    display: flex;
    align-items: center;
    gap: 6px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 2px;
    transition: width var(--transition-fast);
}

.nav-link:hover {
    color: var(--text);
    background-color: var(--toggle-bg);
}

.nav-link:hover::after {
    width: 50%;
}

.nav-link[aria-current="page"] {
    color: var(--accent);
}

.nav-link[aria-current="page"]::after {
    width: 50%;
}

.theme-toggle {
    order: 1;
    background-color: var(--toggle-bg);
    color: var(--text);
    border: none;
    cursor: pointer;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background-color: var(--toggle-bg-hover);
    transform: scale(1.06);
}

.theme-toggle:active {
    transform: scale(0.94);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.theme-icon-svg {
    width: 20px;
    height: 20px;
    overflow: visible;
}

.moon-icon,
.sun-icon {
    transform-origin: center;
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

:root[data-theme="dark"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

:root[data-theme="dark"] .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

/* ==================== Page ==================== */
.page {
    flex: 1;
    margin-top: 90px;
}

/* ==================== Hero ==================== */
.hero {
    min-height: calc(100vh - 180px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
}

.hero-content {
    max-width: 720px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    background: linear-gradient(135deg, 
        color-mix(in srgb, var(--accent) 10%, transparent),
        color-mix(in srgb, var(--accent) 4%, transparent)
    );
    border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
    padding: 6px 18px;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
    letter-spacing: 0.3px;
    backdrop-filter: blur(4px);
    transition: all var(--transition-fast);
}

.badge:hover {
    border-color: var(--accent);
    transform: scale(1.02);
}

.hero-name {
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

:root[data-theme="dark"] .hero-name {
    background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-role {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.hero-bio {
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    line-height: 2;
    color: var(--text-secondary);
    max-width: 580px;
    margin: 0 auto;
}

/* ==================== Skills ==================== */
.skills {
    padding: 60px 0 80px;
    position: relative;
    overflow: hidden;
}

.skills::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}

.skills::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.title-fa {
    display: block;
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 4px;
    position: relative;
}

.title-fa::after {
    content: '';
    display: block;
    width: 56px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    margin: 14px auto 0;
    border-radius: 3px;
    transition: width var(--transition-base);
}

.title-fa:hover::after {
    width: 80px;
}

.title-en {
    display: block;
    font-size: 14px;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.skill-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    cursor: default;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.skill-card:hover::before {
    transform: scaleX(1);
}

.skill-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, var(--accent-glow), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.skill-card:hover::after {
    opacity: 1;
}

.skill-card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-8px);
    border-color: color-mix(in srgb, var(--accent) 25%, transparent);
}

.skill-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
    position: relative;
    z-index: 1;
}

.skill-card p {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
    margin-bottom: 12px;
}

.skill-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    padding: 3px 12px;
    border-radius: var(--radius-full);
    position: relative;
    z-index: 1;
    border: 1px solid color-mix(in srgb, var(--accent) 15%, transparent);
}

.skill-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    position: relative;
    z-index: 1;
    transition: transform var(--transition-base);
}

.skill-card:hover .skill-icon {
    transform: rotateY(-12deg) scale(1.05);
}

.skill-icon svg {
    display: block;
    width: 100%;
    height: 100%;
}

.icon-shadow {
    fill: rgba(15, 23, 42, 0.10);
}

:root[data-theme="dark"] .icon-shadow {
    fill: rgba(0, 0, 0, 0.3);
}

.icon-base {
    fill: var(--accent);
    transition: fill var(--transition-base);
}

/* ==================== Contact ==================== */
.contact {
    padding: 60px 0 80px;
    position: relative;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 36px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    color: var(--text);
    text-decoration: none;
    transition: all var(--transition-fast);
    width: 100%;
    max-width: 420px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-glow), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.contact-item:hover::before {
    opacity: 1;
}

.contact-item:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.contact-item svg {
    flex-shrink: 0;
    transition: transform var(--transition-fast);
    position: relative;
    z-index: 1;
}

.contact-item:hover svg {
    transform: scale(1.15);
}

.contact-item span {
    font-size: 15px;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

/* ==================== Footer ==================== */
.site-footer {
    text-align: center;
    padding: 32px 24px 48px;
    font-size: 14px;
    color: var(--text-muted);
    border-top: 1px solid var(--card-border);
    margin-top: auto;
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skill-card {
    animation: fadeInUp 0.7s ease forwards;
    opacity: 0;
}

.skill-card:nth-child(1) { animation-delay: 0.05s; }
.skill-card:nth-child(2) { animation-delay: 0.15s; }
.skill-card:nth-child(3) { animation-delay: 0.25s; }
.skill-card:nth-child(4) { animation-delay: 0.35s; }

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.badge {
    animation: pulse 3s ease-in-out infinite;
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .navbar {
        top: 14px;
        width: 94%;
        padding: 10px 18px;
        border-radius: var(--radius-md);
        flex-wrap: wrap;
        row-gap: 10px;
    }

    .navbar.is-scrolled {
        padding: 8px 18px;
        top: 10px;
    }

    .navbar-brand {
        font-size: 17px;
    }

    .nav-menu {
        gap: 4px;
        position: static;
        transform: none;
        order: 3;
        flex-basis: 100%;
        justify-content: center;
    }

    .nav-link {
        font-size: 13px;
        padding: 4px 12px;
    }

    .theme-toggle {
        width: 34px;
        height: 34px;
    }

    .theme-icon-svg {
        width: 18px;
        height: 18px;
    }

    .page {
        margin-top: 128px;
    }

    .hero {
        min-height: auto;
        padding: 40px 20px 60px;
    }

    .skills {
        padding: 40px 0 60px;
    }

    .section-title {
        margin-bottom: 32px;
    }

    .contact {
        padding: 40px 0 60px;
    }

    .contact-item {
        padding: 14px 24px;
        max-width: 100%;
    }

    .contact-item span {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .skills-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .skill-card {
        padding: 24px 20px;
    }

    .skill-card:hover {
        transform: translateY(-4px);
    }
}

/* ==================== Accessibility ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }

    .skill-card {
        opacity: 1;
        animation: none;
    }

    .badge {
        animation: none;
    }

    .skill-card:hover {
        transform: none !important;
    }

    .skill-card:hover .skill-icon {
        transform: none !important;
    }
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

::selection {
    background-color: var(--accent);
    color: var(--accent-contrast);
}
/* ==================== Portfolio page ==================== */
.portfolio-header {
    text-align: center;
    padding: 40px 24px 20px;
    position: relative;
}

.portfolio-header h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 8px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.portfolio-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-md);
    background-color: var(--toggle-bg);
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition-fast);
    border: 1px solid var(--card-border);
    margin-bottom: 20px;
}

.btn-back:hover {
    background-color: var(--toggle-bg-hover);
    transform: translateX(4px);
    border-color: var(--accent);
    color: var(--accent);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
    padding: 20px 0 60px;
}

.portfolio-item {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--card-shadow);
    position: relative;
    animation: fadeInUp 0.7s ease forwards;
    opacity: 0;
}

.portfolio-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
    z-index: 2;
}

.portfolio-item:hover::before {
    transform: scaleX(1);
}

.portfolio-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, var(--accent-glow), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    z-index: 1;
}

.portfolio-item:hover::after {
    opacity: 1;
}

.portfolio-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
    border-color: color-mix(in srgb, var(--accent) 25%, transparent);
}

.portfolio-item:nth-child(1) { animation-delay: 0.05s; }
.portfolio-item:nth-child(2) { animation-delay: 0.15s; }
.portfolio-item:nth-child(3) { animation-delay: 0.25s; }

.portfolio-thumbnail {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, var(--accent-glow), var(--bg-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.portfolio-thumbnail .project-icon {
    width: 80px;
    height: 80px;
    opacity: 0.3;
    transition: all var(--transition-base);
    color: var(--text);
    position: relative;
    z-index: 1;
}

.portfolio-item:hover .project-icon {
    opacity: 0.6;
    transform: scale(1.1) rotateY(-10deg);
}

.portfolio-thumbnail .project-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent-contrast);
    background: var(--accent-gradient);
    padding: 4px 14px;
    border-radius: var(--radius-full);
    opacity: 0.9;
    z-index: 2;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.portfolio-info {
    padding: 24px 24px 28px;
    position: relative;
    z-index: 2;
}

.portfolio-info h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
    transition: color var(--transition-fast);
}

.portfolio-item:hover .portfolio-info h3 {
    color: var(--accent);
}

.portfolio-info p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 16px;
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.portfolio-tags span {
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    padding: 3px 12px;
    border-radius: var(--radius-full);
    border: 1px solid color-mix(in srgb, var(--accent) 12%, transparent);
    transition: all var(--transition-fast);
}

.portfolio-item:hover .portfolio-tags span {
    background: color-mix(in srgb, var(--accent) 15%, transparent);
    border-color: var(--accent);
}

.portfolio-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.portfolio-link:hover {
    gap: 14px;
    color: var(--accent-light);
}

.portfolio-link svg {
    transition: transform var(--transition-fast);
}

.portfolio-link:hover svg {
    transform: translateX(-4px);
}

@media (max-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .portfolio-header {
        padding: 30px 20px 16px;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 16px 0 40px;
    }

    .portfolio-thumbnail {
        height: 180px;
    }

    .portfolio-info {
        padding: 20px 20px 24px;
    }

    .portfolio-thumbnail .project-icon {
        width: 60px;
        height: 60px;
    }

    .btn-back {
        padding: 8px 18px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .portfolio-grid {
        gap: 16px;
    }

    .portfolio-thumbnail {
        height: 160px;
    }

    .portfolio-info {
        padding: 16px 16px 20px;
    }

    .portfolio-info h3 {
        font-size: 16px;
    }

    .portfolio-info p {
        font-size: 13px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .portfolio-item {
        opacity: 1;
        animation: none;
    }

    .portfolio-item:hover,
    .portfolio-item:hover .project-icon {
        transform: none !important;
    }
}