/* ========================================
   Arman Kazmi - Personal Website
   Iteration 2: Refined & Professional
   ======================================== */

/* Variables */
:root {
    --color-bg: #ffffff;
    --color-bg-alt: #fafbfc;
    --color-text: #111827;
    --color-text-secondary: #4b5563;
    --color-text-muted: #6b7280;
    --color-text-faint: #9ca3af;
    --color-accent: #0f4c75;
    --color-accent-dark: #0a3a5a;
    --color-accent-light: #e8f1f8;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --font-serif: 'Newsreader', Georgia, serif;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 5rem;
    --space-5xl: 6rem;

    --max-width: 720px;
    --nav-height: 60px;

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-full: 9999px;

    --transition-fast: 120ms ease;
    --transition-base: 180ms ease;
}

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

/* Base */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + var(--space-xl));
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
}

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

.nav-logo {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-links a {
    position: relative;
    font-size: 0.875rem;
    font-weight: 450;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

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

.nav-links a:hover::after {
    width: 100%;
}

/* ========================================
   Main Content
   ======================================== */

.main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-3xl) var(--space-lg) var(--space-5xl);
}

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

.hero {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-2xl);
    align-items: start;
    padding-bottom: var(--space-4xl);
    margin-bottom: var(--space-4xl);
    border-bottom: 1px solid var(--color-border-light);
}

.hero-profile {
    position: relative;
}

.hero-avatar {
    width: 200px;
    height: 300px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.hero-content {
    padding-top: var(--space-xs);
}

.hero-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.hero h1 {
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.025em;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.hero-break {
    display: none;
}

.hero-statement {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-style: italic;
    line-height: 1.65;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.hero-social {
    display: flex;
    gap: var(--space-sm);
}

.hero-social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.hero-social-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-accent);
    color: white;
    border: 1px solid var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
}

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

.btn-secondary:hover {
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

/* ========================================
   Sections
   ======================================== */

.section {
    margin-bottom: var(--space-4xl);
}

.section-last {
    margin-bottom: 0;
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.section-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

/* ========================================
   About Section
   ======================================== */

.about-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.about-content p:last-child {
    margin-bottom: 0;
}

.about-content .lead {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

/* ========================================
   Timeline (Work Section)
   ======================================== */

.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 3px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-2xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--space-xl) - 3px);
    top: 6px;
    width: 7px;
    height: 7px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    border: 2px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-border);
}

.timeline-current .timeline-marker {
    background: var(--color-accent);
    box-shadow: 0 0 0 2px var(--color-accent-light);
}

.timeline-content {
    padding-left: var(--space-md);
}

.timeline-date {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.timeline-content h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
    margin: var(--space-xs) 0;
}

.timeline-org {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.timeline-content > p:last-child {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.timeline-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.timeline-list li {
    position: relative;
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-xs);
}

.timeline-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
}

.timeline-list li:last-child {
    margin-bottom: 0;
}

.timeline-detail {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ========================================
   Research Section
   ======================================== */

.research-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.research-item {
    position: relative;
    padding: var(--space-xl);
    padding-left: calc(var(--space-xl) + 3px);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.research-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-accent);
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.research-item:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

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

.research-meta {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.research-tag {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.research-tag-muted {
    background: var(--color-bg-alt);
    color: var(--color-text-muted);
}

.research-item h3 {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.research-item > p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.research-authors {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    font-style: italic;
}

.research-summary {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.research-abstract {
    margin-bottom: var(--space-md);
}

.research-abstract summary {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent);
    cursor: pointer;
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.research-abstract summary:hover {
    color: var(--color-accent-dark);
}

.research-abstract[open] summary {
    margin-bottom: var(--space-sm);
}

.research-abstract p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    padding: var(--space-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border-left: 2px solid var(--color-accent);
}

.research-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.research-link-code {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.research-link-code:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

.research-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    text-decoration: none;
    transition: gap var(--transition-fast);
}

.research-link:hover {
    gap: var(--space-sm);
}

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

.research-link:hover svg {
    transform: translate(2px, -2px);
}

/* ========================================
   Research Projects Section
   ======================================== */

.research-projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.research-project-item {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
}

.research-project-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.research-project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xs);
}

.research-project-location {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.research-project-item h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.research-project-item .timeline-org {
    margin-bottom: var(--space-sm);
}

.research-project-item .timeline-list {
    margin-top: var(--space-sm);
}

.research-project-item .timeline-list a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.research-project-item .timeline-list a:hover {
    text-decoration: underline;
}

/* ========================================
   Leadership & Activities Section
   ======================================== */

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.activity-group {
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
}

.activity-group-title {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.activity-item {
    margin-bottom: var(--space-lg);
}

.activity-item:last-child {
    margin-bottom: 0;
}

.activity-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.activity-item .timeline-org {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.activity-item > p:last-child {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

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

.writing-empty {
    padding: var(--space-xl);
    background: var(--color-bg-alt);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-lg);
}

.writing-empty p {
    font-size: 0.925rem;
    font-style: italic;
    color: var(--color-text-muted);
    margin: 0;
}

/* ========================================
   Contact Section
   ======================================== */

.contact-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.contact-primary {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.contact-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.contact-email {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-email:hover {
    color: var(--color-accent-dark);
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-weight: 450;
    color: var(--color-text-secondary);
    text-decoration: none;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.contact-link svg {
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.contact-link:hover {
    color: var(--color-text);
    border-color: var(--color-border);
    background: var(--color-bg);
}

.contact-link:hover svg {
    opacity: 0.9;
}

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

.footer {
    border-top: 1px solid var(--color-border-light);
    padding: var(--space-xl) var(--space-lg);
}

.footer p {
    max-width: var(--max-width);
    margin: 0 auto;
    font-size: 0.8rem;
    color: var(--color-text-faint);
}

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

@media (max-width: 640px) {
    :root {
        --nav-height: 56px;
    }

    .nav-inner {
        padding: 0 var(--space-md);
    }

    .nav-links {
        gap: var(--space-md);
    }

    .nav-links a {
        font-size: 0.8rem;
    }

    .main {
        padding: var(--space-xl) var(--space-md) var(--space-3xl);
    }

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

    .hero-profile {
        justify-self: center;
    }

    .hero-avatar {
        width: 120px;
        height: 120px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-break {
        display: none;
    }

    .hero-statement {
        font-size: 1.05rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: var(--space-md);
    }

    .hero-social {
        gap: var(--space-md);
    }

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

    .research-project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    .section {
        margin-bottom: var(--space-3xl);
    }

    .timeline {
        padding-left: var(--space-lg);
    }

    .timeline-marker {
        left: calc(-1 * var(--space-lg) - 3px);
    }

    .research-item {
        padding: var(--space-lg);
        padding-left: calc(var(--space-lg) + 3px);
    }

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

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

/* ========================================
   Print
   ======================================== */

@media print {
    .nav {
        display: none;
    }

    body {
        font-size: 11pt;
    }

    .main {
        max-width: none;
        padding: 0;
    }

    .hero {
        grid-template-columns: auto 1fr;
    }

    .hero-avatar {
        width: 80px;
        height: 80px;
    }

    .btn {
        display: none;
    }

    .research-item,
    .contact-link {
        break-inside: avoid;
    }

    .footer {
        display: none;
    }

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