/**
 * Portfolio CMS — Premium frontend styles
 * Instrument Serif + Plus Jakarta Sans
 */

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

:root {
    --color-primary: #141419;
    --color-accent: #b8956a;
    --color-surface: #f7f6f3;
    --color-text: #141419;
    --color-muted: rgba(20, 20, 25, 0.55);
    --color-border: rgba(20, 20, 25, 0.08);
    --color-card: #ffffff;
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 24px rgba(20, 20, 25, 0.06);
    --shadow-lg: 0 12px 48px rgba(20, 20, 25, 0.1);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --header-height: 72px;
}

[data-theme="dark"] {
    --color-surface: #0e0e12;
    --color-text: #f0efe9;
    --color-muted: rgba(240, 239, 233, 0.5);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-card: #16161c;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.4);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-surface);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

.container {
    width: min(1120px, 92vw);
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    padding: 0.5rem 1rem;
    background: var(--color-accent);
    color: #fff;
    z-index: 9999;
    border-radius: 4px;
}
.skip-link:focus { top: 1rem; }

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: color-mix(in srgb, var(--color-surface) 85%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: var(--space-md);
}

.site-logo .logo-text {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 400;
    letter-spacing: -0.02em;
}

.site-nav {
    display: flex;
    gap: 0.25rem;
}

.nav-item {
    padding: 0.5rem 0.85rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-muted);
    border-radius: 8px;
    transition: all var(--transition);
}

.nav-item:hover {
    color: var(--color-text);
    background: var(--color-border);
}

.nav-item.active {
    color: var(--color-accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition);
}

.theme-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-surface);
}

[data-theme="dark"] .btn-primary {
    background: var(--color-accent);
    color: var(--color-primary);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    color: var(--color-surface);
}

.btn-outline {
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-ghost {
    background: transparent;
    color: var(--color-muted);
    padding-inline: 1rem;
}

.btn-ghost:hover { color: var(--color-accent); }
.btn-sm { padding: 0.5rem 1rem; font-size: 0.8125rem; }

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: var(--header-height);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 60%;
    height: 80%;
    background: radial-gradient(ellipse, color-mix(in srgb, var(--color-accent) 12%, transparent), transparent 70%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    padding-block: var(--space-xl);
}

.hero-eyebrow {
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.75rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-muted);
    max-width: 480px;
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-photo-frame {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero-photo-frame::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 1px solid var(--color-border);
    border-radius: inherit;
    pointer-events: none;
}

.hero-photo-frame img {
    width: 100%;
    aspect-ratio: 4/5;
    object-fit: cover;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-muted);
    animation: float 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(6px); }
}

/* Sections */
.section {
    padding-block: var(--space-2xl);
}

.section-alt {
    background: color-mix(in srgb, var(--color-primary) 3%, var(--color-surface));
}

.section-header {
    margin-bottom: var(--space-xl);
}

.section-number {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 400;
    letter-spacing: -0.02em;
}

.section-cta { text-align: center; margin-top: var(--space-lg); }

/* Cards */
.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-md);
    transition: all var(--transition);
}

.card:hover {
    box-shadow: var(--shadow);
    border-color: color-mix(in srgb, var(--color-accent) 30%, var(--color-border));
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-xl);
    align-items: start;
}

.lead-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.prose p { margin-bottom: 1rem; }
.prose p:last-child { margin-bottom: 0; }

/* Timeline */
.timeline { position: relative; padding-left: 2rem; }

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-lg);
}

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 1.5rem;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-surface);
}

.timeline-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8125rem;
    color: var(--color-muted);
    margin-bottom: 0.5rem;
}

.timeline-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.timeline-company { color: var(--color-accent); font-weight: 500; margin-bottom: 0.75rem; }
.timeline-desc { font-size: 0.9375rem; color: var(--color-muted); }

/* Education */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.edu-meta { font-size: 0.8125rem; color: var(--color-muted); margin-bottom: 0.5rem; }
.edu-degree { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.25rem; }
.edu-institution { color: var(--color-accent); font-weight: 500; }
.edu-field { font-size: 0.875rem; color: var(--color-muted); margin-top: 0.5rem; }

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.skill-category {
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: var(--space-md);
}

.skill-item { margin-bottom: 1rem; }

.skill-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    margin-bottom: 0.4rem;
}

.skill-level { color: var(--color-muted); font-size: 0.8125rem; }

.skill-bar {
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: 2px;
    transition: width 1s ease;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-md);
}

.project-card { padding: 0; overflow: hidden; }

.project-image {
    display: block;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.project-card:hover .project-image img { transform: scale(1.04); }

.project-body { padding: var(--space-md); }

.project-badge {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.project-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.project-excerpt {
    font-size: 0.875rem;
    color: var(--color-muted);
    margin-bottom: 0.75rem;
}

.project-tags, .tag {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.65rem;
    background: color-mix(in srgb, var(--color-accent) 10%, transparent);
    color: var(--color-accent);
    border-radius: 6px;
}

/* Certificates */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-md);
}

.cert-image {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: var(--radius) var(--radius) 0 0;
    margin: calc(var(--space-md) * -1) calc(var(--space-md) * -1) var(--space-sm);
    width: calc(100% + var(--space-md) * 2);
}

.cert-issuer { color: var(--color-muted); font-size: 0.875rem; margin: 0.25rem 0; }
.cert-link { font-size: 0.875rem; font-weight: 600; color: var(--color-accent); }

/* References */
.refs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-md);
}

.ref-content {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-style: italic;
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.ref-author {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-style: normal;
}

.ref-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
}

.ref-author cite {
    display: block;
    font-weight: 600;
    font-style: normal;
    font-size: 0.9375rem;
}

.ref-author span { font-size: 0.8125rem; color: var(--color-muted); }

/* Blog */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.blog-grid-full { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }

.blog-card { padding: 0; overflow: hidden; }

.blog-image {
    display: block;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.blog-card:hover .blog-image img { transform: scale(1.03); }

.blog-body { padding: var(--space-md); }

.blog-body time {
    font-size: 0.75rem;
    color: var(--color-muted);
    letter-spacing: 0.04em;
}

.blog-body h2, .blog-body h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin: 0.5rem 0;
    line-height: 1.4;
}

.blog-body p { font-size: 0.875rem; color: var(--color-muted); }

.read-more { font-size: 0.875rem; font-weight: 600; color: var(--color-accent); }

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-xl);
    align-items: start;
}

.contact-item { margin-bottom: var(--space-md); }

.contact-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 0.25rem;
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}

.form-field { margin-bottom: var(--space-sm); }

.form-field label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
}

.form-field input,
.form-field textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition);
}

.form-field input:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* Page sections */
.page-section { padding-top: calc(var(--header-height) + var(--space-xl)); }

.page-header { margin-bottom: var(--space-xl); }

.page-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    margin-top: var(--space-sm);
}

.back-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-muted);
}

.article-container { max-width: 760px; }

.article-cover {
    margin-bottom: var(--space-lg);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.article-header { margin-bottom: var(--space-lg); }

.article-header time {
    font-size: 0.8125rem;
    color: var(--color-muted);
}

.article-header h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin: var(--space-sm) 0;
    letter-spacing: -0.02em;
}

.article-excerpt {
    font-size: 1.125rem;
    color: var(--color-muted);
}

.project-links { display: flex; gap: 0.75rem; margin: var(--space-md) 0; }

.empty-note { color: var(--color-muted); font-size: 0.9375rem; }

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0;
    margin-top: var(--space-lg);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-md);
}

.footer-name {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    display: block;
}

.footer-role { font-size: 0.875rem; color: var(--color-muted); }

.footer-social {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-social a {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-muted);
}

.footer-copy { font-size: 0.75rem; color: var(--color-muted); }

/* Reveal animations */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
    .hero-grid,
    .about-grid,
    .contact-grid { grid-template-columns: 1fr; }

    .hero-visual { order: -1; max-width: 320px; margin-inline: auto; }
    .hero-photo-frame img { aspect-ratio: 1; }

    .site-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 1rem;
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition);
    }

    .site-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-toggle { display: flex; }

    .header-actions .btn-outline { display: none; }
}

@media (max-width: 600px) {
    .contact-form .form-row { grid-template-columns: 1fr; }
    .hero-scroll { display: none; }
}