/* ==========================================================================
   MINIMALIST BLACK & WHITE DESIGN SYSTEM
   ========================================================================== */
:root {
    /* Fonts */
    --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Snap Transitions */
    --transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-fast: all 0.15s ease;

    /* Small Radius for subtle clean frame corners */
    --radius-sm: 4px;
    --radius-md: 4px;
    --radius-round: 50%;

    /* Sticky header height, kept in sync by app.js */
    --header-height: 88px;
}

/* Dark Theme (Default) */
.dark-theme {
    --bg-main: hsl(0, 0%, 5%);
    --bg-surface: hsl(0, 0%, 8%);
    --bg-surface-solid: hsl(0, 0%, 8%);
    --border-color: hsla(0, 0%, 100%, 0.1);
    --border-color-hover: hsla(0, 0%, 100%, 0.3);

    --text-primary: hsl(0, 0%, 95%);
    --text-secondary: hsl(0, 0%, 75%);
    --text-muted: hsl(0, 0%, 45%);

    --glass-bg: rgba(5, 5, 5, 0.8);
    --selection-bg: rgba(255, 255, 255, 0.15);
}

/* Light Theme */
.light-theme {
    --bg-main: hsl(0, 0%, 98%);
    --bg-surface: hsl(0, 0%, 100%);
    --bg-surface-solid: hsl(0, 0%, 100%);
    --border-color: hsla(0, 0%, 0%, 0.1);
    --border-color-hover: hsla(0, 0%, 0%, 0.3);

    --text-primary: hsl(0, 0%, 10%);
    --text-secondary: hsl(0, 0%, 35%);
    --text-muted: hsl(0, 0%, 60%);

    --glass-bg: rgba(255, 255, 255, 0.85);
    --selection-bg: rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   RESET & EDITORIAL BASE
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    /* Keep anchor targets clear of the sticky header */
    scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

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

::selection {
    background-color: var(--selection-bg);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--text-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

@media (hover: hover) {
    img {
        filter: grayscale(100%);
        transition: filter var(--transition), transform var(--transition);
    }

    img:hover {
        filter: grayscale(0%);
    }
}

button, input, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
    outline: none;
}

button {
    cursor: pointer;
}

/* Structural Grid */
.section-container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-divider {
    border: 0;
    height: 1px;
    background-color: var(--border-color);
    margin: 4rem 0;
}

/* ==========================================================================
   HEADER NAVIGATION (MINIMAL)
   ========================================================================== */
.minimal-header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
}

.nav-menu ul {
    display: flex;
    align-items: center;
    gap: 1.4rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

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

.btn-contact {
    border: 1px solid var(--border-color);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-sm);
}

.btn-contact:hover {
    border-color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.theme-toggle-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color var(--transition);
}

.theme-toggle-btn:hover {
    color: var(--text-primary);
}

.dark-theme .theme-toggle-btn .sun-icon { display: block; }
.dark-theme .theme-toggle-btn .moon-icon { display: none; }
.light-theme .theme-toggle-btn .sun-icon { display: none; }
.light-theme .theme-toggle-btn .moon-icon { display: block; }

.mobile-menu-btn {
    display: none;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.mobile-menu-btn .close-icon { display: none; }
.mobile-menu-btn.active .menu-icon { display: none; }
.mobile-menu-btn.active .close-icon { display: block; }

/* ==========================================================================
   HERO LAYOUT
   ========================================================================== */
.hero-section {
    padding: 6rem 0 3rem 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 190px;
    gap: 3rem;
    align-items: start;
}

.badge-minimal {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.3;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-bottom: 2.5rem;
}

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

.hero-visual {
    display: flex;
    justify-content: flex-end;
    margin-top: -3.5rem;
}

.image-frame {
    width: 100%;
    max-width: 185px;
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    padding: 6px;
    border-radius: var(--radius-sm);
    background-color: var(--bg-surface);
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: calc(var(--radius-sm) - 4px);
    /* Opt out of the site-wide greyscale-until-hover treatment: the portrait
       stays in colour at all times. */
    filter: none !important;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.btn-sm {
    padding: 0.4rem 0.9rem;
    font-size: 0.8rem;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-main);
    border: 1px solid var(--text-primary);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--text-primary);
}

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

.btn-outline:hover {
    border-color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.03);
}

.light-theme .btn-outline:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

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

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

/* ==========================================================================
   STATS SECTION
   ========================================================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    text-align: left;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   ABOUT / BIOGRAPHY & SKILLS
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.subsection-title {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin: 3rem 0 1.5rem 0;
}

.subsection-title:first-of-type {
    margin-top: 0;
}

.about-bio p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.social-links-minimal {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 2rem;
}

.social-links-minimal .social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.social-links-minimal .social-link:hover {
    color: var(--text-primary);
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.skill-category h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.skill-category p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ==========================================================================
   TIMELINE (EXPERIENCE & INVOLVEMENT)
   ========================================================================== */
.timeline-table {
    display: flex;
    flex-direction: column;
}

.timeline-row {
    display: grid;
    grid-template-columns: 1fr 1.5fr 2fr;
    gap: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

.timeline-row:first-child {
    padding-top: 0;
}

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

.time-col {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.title-col h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.title-col span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.desc-col {
    font-size: 0.925rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   EXPERTISE SECTION (SERVICES)
   ========================================================================== */
.expertise-table {
    display: flex;
    flex-direction: column;
}

.expertise-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.expertise-row:first-child {
    padding-top: 0;
}

.expertise-row:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}

.num-col {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1;
}

.body-col h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.body-col p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 700px;
}

/* ==========================================================================
   PROJECTS ACCORDION (MINIMALIST)
   ========================================================================== */
.projects-header-minimal {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 3rem;
}

.project-filters {
    display: flex;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.4rem 1rem;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.filter-btn.active {
    background-color: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-main);
}

.projects-accordion-list {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--border-color);
}

.project-accordion-item {
    border-bottom: 1px solid var(--border-color);
    transition: border-color var(--transition);
}

.project-accordion-header {
    display: flex;
    align-items: center;
    padding: 2.25rem 0;
    cursor: pointer;
    user-select: none;
}

.project-num {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-muted);
    width: 80px;
}

.project-header-info {
    flex-grow: 1;
}

.project-meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.project-header-info .project-cat {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    display: block;
}

.project-year {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    white-space: nowrap;
}

.project-header-info .project-title-text {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition);
}

.project-accordion-header:hover .project-title-text {
    color: var(--text-primary);
}

.project-icon-toggle {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.project-accordion-header:hover .project-icon-toggle {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.project-accordion-item.active .project-icon-toggle {
    transform: rotate(45deg);
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.project-accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.project-accordion-inner {
    padding: 0 0 3rem 80px;
    max-width: 820px;
}

.project-accordion-desc p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.accordion-sub-section {
    margin-bottom: 2rem;
}

.accordion-sub-section h4 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.accordion-sub-section ul {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.accordion-sub-section li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.accordion-sub-section li::before {
    content: '—';
    color: var(--text-muted);
}

.accordion-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
}

.accordion-tags span {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

/* ==========================================================================
   CONTACT SECTION (MINIMAL UNDERLINES)
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 5rem;
}

.contact-text p {
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 0.95rem;
}

.contact-details-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-details-list div span {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.contact-details-list div a, .contact-details-list div p {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 500;
}

.contact-details-list div a:hover {
    color: var(--text-primary);
}

.contact-form-minimal {
    position: relative;
}

.form-group-minimal {
    margin-bottom: 2rem;
    position: relative;
}

.form-group-minimal input, .form-group-minimal textarea {
    width: 100%;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    background-color: transparent;
    border-radius: 0;
    transition: border-color var(--transition);
}

.form-group-minimal input:focus, .form-group-minimal textarea:focus {
    border-bottom-color: var(--text-primary);
}

.form-group-minimal.invalid input, .form-group-minimal.invalid textarea {
    border-bottom-color: #ff3b30;
}

.error-msg {
    font-size: 0.75rem;
    color: #ff3b30;
    display: none;
    margin-top: 0.25rem;
}

.form-group-minimal.invalid .error-msg {
    display: block;
}

/* Form Success Modal */
.form-success-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    z-index: 10;
}

.form-success-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.success-content h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.success-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.success-icon-circle {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-round);
    border: 1px solid var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    margin-top: 6rem;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.footer-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem 3rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.75rem;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-link:hover {
    color: var(--text-primary);
}

.footer-link svg,
.footer-link i {
    width: 18px;
    height: 18px;
}

.footer-brand .logo {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.back-to-top-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.back-to-top-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* Modal System Removed - Accordion handles in-page expansions */

/* ==========================================================================
   SCROLL REVEAL & FADE EFFECTS
   ========================================================================== */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.215, 0.610, 0.355, 1), 
                transform 0.6s cubic-bezier(0.215, 0.610, 0.355, 1);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   RESPONSIVE LAYOUTS (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 960px) {
    .hero-grid {
        grid-template-columns: 1fr 120px;
        gap: 1.5rem;
    }
    .hero-visual {
        justify-content: flex-end;
        order: 0;
        margin-top: 0;
    }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .timeline-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        padding: 1.5rem 0;
    }
    .project-accordion-inner {
        padding-left: 0;
    }
    .project-num {
        width: 40px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 880px) {
    /* Mobile menu overlay (kicks in earlier than the phone breakpoint below
       since the nav now has 6 items and gets cramped on tablet widths) */
    .mobile-menu-btn {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg-surface-solid);
        border-bottom: 1px solid var(--border-color);
        padding: 2rem;
        transform: translateY(-150%);
        transition: transform var(--transition);
        z-index: 99;
    }
    .nav-menu.active {
        transform: translateY(0);
    }
    .nav-menu ul {
        flex-direction: column;
        gap: 1.5rem;
        align-items: center;
    }
}

@media (max-width: 640px) {
    .section-container {
        padding: 0 1.25rem;
    }
    .nav-container {
        padding: 1.5rem 1.25rem;
    }
    .hero-title {
        font-size: 2.75rem;
    }
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .hero-grid {
        grid-template-columns: 1fr 51px;
        gap: 0.75rem;
    }
    .hero-visual {
        margin-top: -0.75rem;
    }
    .hero-visual .image-frame {
        max-width: 51px;
        padding: 2px;
    }
    .projects-header-minimal {
        flex-direction: column;
        gap: 1.5rem;
    }
    .project-accordion-header {
        padding: 1.5rem 0;
    }
    .project-num {
        display: none;
    }
    .expertise-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}