/* =============================================
   Perim — Design System
   Apple-minimal meets developer aesthetic
   ============================================= */

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-surface-hover: #f5f5f7;
    --color-surface-alt: #f0f0f2;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-hover: rgba(0, 0, 0, 0.15);
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #a1a1a6;
    --color-accent: #0071e3;
    --color-accent-soft: rgba(0, 113, 227, 0.08);
    --color-fayn: #e85d3a;
    --color-fayn-soft: rgba(232, 93, 58, 0.1);
    --color-upti: #34a853;
    --color-upti-soft: rgba(52, 168, 83, 0.1);
    --color-soon: #a1a1a6;
    --color-soon-soft: rgba(161, 161, 166, 0.08);

    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;

    --spacing-page: clamp(20px, 5vw, 80px);
    --max-width: 920px;

    --transition-base: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--color-text-primary);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

/* =============================================
   Navigation
   ============================================= */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-page);
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    transition: opacity var(--transition-base);
}

.nav-logo:hover { opacity: 0.7; }

.logo-i {
    position: relative;
}

.logo-i::after {
    content: '';
    position: absolute;
    top: -0.5px;
    left: 50%;
    transform: translateX(-50%);
    width: 4.5px;
    height: 4.5px;
    background: var(--color-accent);
    border-radius: 50%;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
    letter-spacing: 0.01em;
}

.nav-links a:hover { color: var(--color-text-primary); }

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 32px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.nav-mobile-toggle span {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 99;
    padding: 16px var(--spacing-page);
    flex-direction: column;
}

.mobile-menu a {
    display: block;
    padding: 14px 0;
    font-size: 1rem;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
}

.mobile-menu a:last-child { border-bottom: none; }

@media (max-width: 600px) {
    .nav-links { display: none; }
    .nav-mobile-toggle { display: flex; }
    .mobile-menu.open { display: flex; }
}

/* =============================================
   Hero
   ============================================= */

.hero {
    padding-top: 140px;
    padding-bottom: 80px;
    padding-left: var(--spacing-page);
    padding-right: var(--spacing-page);
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100%;
    background: linear-gradient(180deg, rgba(0, 113, 227, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.hero-content {
    max-width: 620px;
}

.hero-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.02em;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeUp 0.6s ease forwards 0.1s;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5.5vw, 3.4rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.035em;
    color: var(--color-text-primary);
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(15px);
    animation: fadeUp 0.7s ease forwards 0.2s;
}

.hero-subtitle {
    font-size: 1.1rem;
    line-height: 1.65;
    color: var(--color-text-secondary);
    font-weight: 300;
    max-width: 540px;
    margin-bottom: 28px;
    opacity: 0;
    transform: translateY(15px);
    animation: fadeUp 0.7s ease forwards 0.35s;
}

.hero-links {
    display: flex;
    gap: 10px;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeUp 0.6s ease forwards 0.5s;
}

.hero-link {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    letter-spacing: 0.01em;
}

.hero-link:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    background: var(--color-surface);
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

/* =============================================
   Expertise / What I Do
   ============================================= */

.expertise-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px var(--spacing-page) 72px;
}

.expertise-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.expertise-card {
    padding: 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.expertise-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.expertise-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-soft);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.expertise-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.expertise-card p {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* =============================================
   Section Headers (shared)
   ============================================= */

.section-header {
    margin-bottom: 24px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
}

.expertise-section .section-header {
    border-top: none;
    padding-top: 0;
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
    margin-bottom: 4px;
}

.section-desc {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* =============================================
   Apps Section
   ============================================= */

.apps-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-page) 72px;
}

.apps-grid {
    display: grid;
    gap: 10px;
}

.app-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.app-card:not(.app-card-soon):hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.app-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition-spring);
}

.app-card:not(.app-card-soon):hover .app-card-icon {
    transform: scale(1.05);
}

.fayn-icon { background: var(--color-fayn-soft); color: var(--color-fayn); }
.upti-icon { background: var(--color-upti-soft); color: var(--color-upti); }
.soon-icon { background: var(--color-soon-soft); color: var(--color-soon); }

.app-card-content { flex: 1; min-width: 0; }

.app-card-name {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.app-card-name h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.app-badge {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 500;
    padding: 3px 8px;
    border-radius: 6px;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.app-card-desc {
    font-size: 0.875rem;
    line-height: 1.55;
    color: var(--color-text-secondary);
    font-weight: 300;
    margin-bottom: 8px;
}

.app-card-platforms {
    display: flex;
    gap: 6px;
}

.app-card-platforms span {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--color-text-tertiary);
    background: var(--color-surface-hover);
    padding: 2px 8px;
    border-radius: 4px;
}

.app-card-links {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.app-link {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    padding: 7px 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    letter-spacing: 0.01em;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.app-link:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    background: var(--color-surface-hover);
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

.app-link svg {
    flex-shrink: 0;
}

.app-card-soon { cursor: default; }
.app-card-soon .app-card-name h3 { color: var(--color-text-tertiary); }
.app-card-soon .app-card-desc { color: var(--color-text-tertiary); }

/* =============================================
   Highlights / Notable Work
   ============================================= */

.highlights-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-page) 72px;
}

.highlights-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.highlight-item {
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    transition: all var(--transition-base);
}

.highlight-item:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.highlight-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-accent);
    background: var(--color-accent-soft);
    padding: 3px 8px;
    border-radius: 5px;
    display: inline-block;
    margin-bottom: 12px;
}

.highlight-item h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.highlight-item p {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* =============================================
   Writing Section
   ============================================= */

.writing-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-page) 48px;
}

.writing-content {
    padding: 36px;
    background: var(--color-surface-alt);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.writing-content:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
}

.writing-text h2 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.writing-text p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    font-weight: 300;
    max-width: 480px;
}

.writing-link {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-accent);
    white-space: nowrap;
    padding: 10px 20px;
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.writing-link:hover {
    background: var(--color-accent);
    color: #fff;
}

.writing-link span {
    transition: transform var(--transition-base);
    display: inline-block;
}

.writing-link:hover span {
    transform: translateX(3px);
}

/* =============================================
   Bottom Section
   ============================================= */

.bottom-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 40px var(--spacing-page) 100px;
    text-align: center;
}

.bottom-text {
    font-size: 0.95rem;
    color: var(--color-text-tertiary);
    font-weight: 300;
}

.bottom-text a {
    color: var(--color-text-secondary);
    text-decoration: underline;
    text-decoration-color: var(--color-border);
    text-underline-offset: 3px;
    transition: all var(--transition-base);
}

.bottom-text a:hover {
    color: var(--color-text-primary);
    text-decoration-color: var(--color-text-secondary);
}

/* =============================================
   Footer
   ============================================= */

.footer {
    border-top: 1px solid var(--color-border);
    padding: 32px 0;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-page);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    transition: color var(--transition-base);
}

.footer-links a:hover { color: var(--color-text-secondary); }

/* =============================================
   Sub Pages
   ============================================= */

.page-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 120px var(--spacing-page) 100px;
    min-height: 70vh;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
    opacity: 0;
    transform: translateY(15px);
    animation: fadeUp 0.6s ease forwards 0.1s;
}

.page-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    font-weight: 300;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeUp 0.6s ease forwards 0.2s;
}

.page-body {
    opacity: 0;
    transform: translateY(15px);
    animation: fadeUp 0.6s ease forwards 0.3s;
}

.page-body h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 36px;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.page-body p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    font-weight: 300;
    margin-bottom: 16px;
}

.page-body a {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-color: rgba(0, 113, 227, 0.3);
    text-underline-offset: 3px;
    transition: text-decoration-color var(--transition-base);
}

.page-body a:hover { text-decoration-color: var(--color-accent); }

.page-body ul {
    list-style: none;
    padding: 0;
    margin-bottom: 16px;
}

.page-body ul li {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    font-weight: 300;
    padding-left: 20px;
    position: relative;
    margin-bottom: 6px;
}

.page-body ul li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-text-tertiary);
}

/* About - Links */
.about-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.about-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.about-link:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    text-decoration: none !important;
}

/* About - Stats */
.about-stats {
    display: flex;
    gap: 32px;
    margin: 32px 0;
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.about-stat {
    text-align: left;
}

.about-stat-number {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.about-stat-label {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    font-weight: 400;
}

/* About - Certifications */
.cert-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.cert-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 5px 12px;
    background: var(--color-surface-hover);
    border-radius: 6px;
    color: var(--color-text-secondary);
    letter-spacing: 0.01em;
}

/* Support - Contact Card */
.contact-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px;
    margin-top: 24px;
}

.contact-card p {
    margin-bottom: 8px;
}

.contact-card p:last-child { margin-bottom: 0; }

/* =============================================
   Animations
   ============================================= */

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

/* =============================================
   Responsive
   ============================================= */

@media (max-width: 700px) {
    .hero {
        padding-top: 110px;
        padding-bottom: 48px;
    }

    .expertise-grid {
        grid-template-columns: 1fr;
    }

    .highlights-grid {
        grid-template-columns: 1fr;
    }

    .app-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 24px;
    }

    .app-card-links {
        width: 100%;
    }

    .writing-content {
        flex-direction: column;
        text-align: center;
        padding: 28px;
    }

    .writing-text p {
        max-width: 100%;
    }

    .footer-inner {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .about-links {
        flex-direction: column;
    }

    .about-link {
        justify-content: center;
    }

    .about-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

    .hero-links {
        flex-wrap: wrap;
    }
}