/* ========================================
   Tehiru Aerial Systems — Mechanical Engineering
   Portfolio Site Styles
   ======================================== */

:root {
    --teal-dark: #0A5C5F;
    --teal: #0D7377;
    --teal-light: #14919B;
    --teal-accent: #17B5BE;
    --grey-bg: #F0F2F5;
    --grey-light: #E4E7EC;
    --grey-mid: #C4C9D4;
    --grey-dark: #6B7280;
    --charcoal: #1A1A2E;
    --charcoal-light: #2D2D44;
    --white: #FFFFFF;
    --card-bg: #FAFBFC;
    --border: #D1D5DB;
    --blueprint-line: rgba(13, 115, 119, 0.06);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--grey-bg);
    color: var(--charcoal);
    line-height: 1.6;
    min-height: 100vh;
    /* Blueprint grid background */
    background-image:
        repeating-linear-gradient(0deg, var(--blueprint-line) 0px, var(--blueprint-line) 1px, transparent 1px, transparent 40px),
        repeating-linear-gradient(90deg, var(--blueprint-line) 0px, var(--blueprint-line) 1px, transparent 1px, transparent 40px);
    background-size: 40px 40px;
}

/* ---- Header ---- */
.site-header {
    background: var(--charcoal);
    border-bottom: 3px solid var(--teal);
    padding: 2rem 2rem;
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}

.site-title {
    font-family: 'Roboto Mono', monospace;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--white);
    letter-spacing: 0.05em;
}

.site-subtitle {
    font-family: 'Roboto Mono', monospace;
    font-weight: 400;
    font-size: 0.8rem;
    color: #A0D2D4;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-top: 0.3rem;
}

/* ---- Navigation ---- */
.project-nav {
    background: var(--white);
    border-bottom: 1px solid var(--grey-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.nav-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 0;
}

.nav-tab {
    background: none;
    border: none;
    padding: 1rem 2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--grey-dark);
    transition: color 0.25s ease, background-color 0.25s ease;
    border-bottom: 2px solid transparent;
    position: relative;
}

.nav-tab:hover {
    color: var(--charcoal);
    background-color: rgba(13, 115, 119, 0.04);
}

.nav-tab.active {
    color: var(--teal);
    border-bottom-color: var(--teal);
}



/* ---- Project Sections ---- */
.project-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
}

.project-section {
    display: none;
    animation: fadeIn 0.35s ease;
}

.project-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero / 3D Model Placeholder */
.project-hero {
    margin-bottom: 2rem;
}

.hero-image-placeholder {
    background: var(--charcoal);
    border: 1px solid var(--charcoal-light);
    border-radius: 2px;
    height: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
    /* Blueprint grid overlay */
    background-image:
        repeating-linear-gradient(0deg, rgba(13,115,119,0.08) 0px, rgba(13,115,119,0.08) 1px, transparent 1px, transparent 30px),
        repeating-linear-gradient(90deg, rgba(13,115,119,0.08) 0px, rgba(13,115,119,0.08) 1px, transparent 1px, transparent 30px);
    background-size: 30px 30px;
}

.placeholder-icon {
    width: 100px;
    height: 100px;
    color: var(--teal-light);
    opacity: 0.6;
}

.placeholder-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.75rem;
    color: var(--teal-light);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0.6;
}

/* 3D Model Viewer */
.model-viewer-container {
    background: var(--charcoal);
    border: 1px solid var(--charcoal-light);
    border-radius: 2px;
    height: 250px;
    position: relative;
    overflow: hidden;
}

.model-viewer-container model-viewer {
    --poster-color: transparent;
}

.model-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.8rem;
    color: var(--teal-light);
    letter-spacing: 0.1em;
}

model-viewer::part(default-progress-bar) {
    background-color: var(--teal);
    height: 3px;
}

/* Corner marks on hero */
.hero-image-placeholder::before,
.hero-image-placeholder::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: var(--teal);
    border-style: solid;
    opacity: 0.4;
}
.hero-image-placeholder::before {
    top: 12px; left: 12px;
    border-width: 1px 0 0 1px;
}
.hero-image-placeholder::after {
    bottom: 12px; right: 12px;
    border-width: 0 1px 1px 0;
}

/* Media Section (3D + Video at bottom) */
.project-media {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Video Section */
.project-video {
    margin-bottom: 2rem;
}

.video-container {
    background: var(--charcoal);
    border: 1px solid var(--charcoal-light);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.video-container video {
    width: 100%;
    max-height: 250px;
    object-fit: contain;
    display: block;
    background: var(--charcoal);
}

.video-caption {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.7rem;
    color: var(--grey-dark);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-align: center;
    margin-top: 0.6rem;
}

/* Project Content */
.project-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.project-info {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 1.75rem;
}

.project-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-title {
    font-family: 'Roboto Mono', monospace;
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--charcoal);
    letter-spacing: -0.01em;
}

.project-status {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.3rem 0.7rem;
    border-radius: 1px;
}

.status-active {
    background: rgba(13, 115, 119, 0.1);
    color: var(--teal);
    border: 1px solid rgba(13, 115, 119, 0.2);
}

.status-concept {
    background: rgba(107, 114, 128, 0.1);
    color: var(--grey-dark);
    border: 1px solid rgba(107, 114, 128, 0.2);
}

.project-description {
    font-size: 0.9rem;
    color: var(--charcoal-light);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* Spec Grid */
.spec-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    border-top: 1px solid var(--grey-light);
    padding-top: 1.25rem;
}

.spec-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.spec-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--grey-dark);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.spec-value {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--charcoal);
}

/* Updates / Timeline */
.project-updates {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 1.75rem;
}

.updates-title {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--charcoal);
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--grey-light);
    letter-spacing: 0.02em;
}

.timeline {
    position: relative;
    padding-left: 1.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 4px;
    bottom: 4px;
    width: 1px;
    background: var(--grey-light);
}

.timeline-item {
    position: relative;
    padding-bottom: 1.5rem;
}

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

.timeline-marker {
    position: absolute;
    left: -1.5rem;
    top: 4px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--teal);
    border: 2px solid var(--white);
    box-shadow: 0 0 0 2px var(--teal);
    z-index: 1;
}

.timeline-marker.hollow {
    background: var(--white);
    box-shadow: 0 0 0 2px var(--grey-mid);
}

.timeline-date {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--teal);
    letter-spacing: 0.03em;
    display: block;
    margin-bottom: 0.3rem;
}

.timeline-item:has(.hollow) .timeline-date {
    color: var(--grey-dark);
}

.timeline-text {
    font-size: 0.85rem;
    color: var(--charcoal-light);
    line-height: 1.6;
}

/* ---- Footer ---- */
.site-footer {
    border-top: 1px solid var(--grey-light);
    background: var(--white);
    padding: 1.5rem 2rem;
    margin-top: 2rem;
}

.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.footer-text {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.7rem;
    color: var(--grey-dark);
    letter-spacing: 0.05em;
}

.footer-divider {
    color: var(--grey-mid);
    font-size: 0.75rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .header-inner {
        padding: 0 0.5rem;
    }

    .site-title {
        font-size: 1.15rem;
    }

    .nav-tab {
        padding: 0.85rem 1.25rem;
        font-size: 0.8rem;
    }

    .tab-index {
        display: none;
    }

    .project-content {
        grid-template-columns: 1fr;
    }

    .hero-image-placeholder {
        height: 250px;
    }

    .project-container {
        padding: 1.5rem 1rem 2rem;
    }
}

@media (max-width: 480px) {
    .nav-inner {
        gap: 0;
    }

    .nav-tab {
        padding: 0.75rem 0.85rem;
        font-size: 0.75rem;
    }

    .site-title {
        font-size: 1rem;
    }

    .site-subtitle {
        font-size: 0.65rem;
    }

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

/* ========================================
   3D Generator
   ======================================== */

.generator-panel {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.generator-header {
    padding: 1.75rem 1.75rem 1.25rem;
    border-bottom: 1px solid var(--grey-light);
}

/* Input area */
.generator-input-area {
    padding: 1.5rem 1.75rem;
}

.generator-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--grey-dark);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.6rem;
}

.generator-textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    border: 2px solid var(--grey-light);
    border-radius: 2px;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.88rem;
    color: var(--charcoal);
    background: var(--grey-bg);
    resize: vertical;
    min-height: 70px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    line-height: 1.5;
    /* Blueprint grid subtle bg */
    background-image:
        repeating-linear-gradient(0deg, rgba(13,115,119,0.02) 0px, rgba(13,115,119,0.02) 1px, transparent 1px, transparent 24px),
        repeating-linear-gradient(90deg, rgba(13,115,119,0.02) 0px, rgba(13,115,119,0.02) 1px, transparent 1px, transparent 24px);
    background-size: 24px 24px;
    background-color: var(--grey-bg);
}

.generator-textarea::placeholder {
    color: var(--grey-mid);
    font-style: italic;
}

.generator-textarea:focus {
    outline: none;
    border-color: var(--teal-light);
    box-shadow: 0 0 0 3px rgba(13, 115, 119, 0.1);
}

.generator-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.generator-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--teal);
    color: var(--white);
    border: none;
    border-radius: 2px;
    padding: 0.65rem 1.5rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.generator-btn:hover {
    background: var(--teal-dark);
}

.generator-btn:active {
    transform: scale(0.98);
}

.generator-btn:disabled {
    background: var(--grey-mid);
    cursor: not-allowed;
    transform: none;
}

.generator-hint {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.68rem;
    color: var(--grey-dark);
    letter-spacing: 0.03em;
}

/* Loading animation */
.generator-loading {
    padding: 3rem 1.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    border-top: 1px solid var(--grey-light);
    background: var(--grey-bg);
    background-image:
        repeating-linear-gradient(0deg, rgba(13,115,119,0.03) 0px, rgba(13,115,119,0.03) 1px, transparent 1px, transparent 30px),
        repeating-linear-gradient(90deg, rgba(13,115,119,0.03) 0px, rgba(13,115,119,0.03) 1px, transparent 1px, transparent 30px);
    background-size: 30px 30px;
}

/* 3D spinning wireframe cube */
.gen-spinner {
    perspective: 200px;
    width: 60px;
    height: 60px;
}

.gen-cube {
    width: 60px;
    height: 60px;
    position: relative;
    transform-style: preserve-3d;
    animation: genCubeSpin 3s linear infinite;
}

@keyframes genCubeSpin {
    0%   { transform: rotateX(0deg) rotateY(0deg); }
    100% { transform: rotateX(360deg) rotateY(360deg); }
}

.gen-cube-face {
    position: absolute;
    width: 60px;
    height: 60px;
    border: 2px solid var(--teal-light);
    background: rgba(13, 115, 119, 0.05);
    box-sizing: border-box;
}

.gen-cube-front  { transform: translateZ(30px); }
.gen-cube-back   { transform: rotateY(180deg) translateZ(30px); }
.gen-cube-right  { transform: rotateY(90deg) translateZ(30px); }
.gen-cube-left   { transform: rotateY(-90deg) translateZ(30px); }
.gen-cube-top    { transform: rotateX(90deg) translateZ(30px); }
.gen-cube-bottom { transform: rotateX(-90deg) translateZ(30px); }

.gen-loading-text {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--teal);
    letter-spacing: 0.04em;
}

.gen-dots::after {
    content: '';
    animation: genDots 1.5s steps(4, end) infinite;
}

@keyframes genDots {
    0%  { content: ''; }
    25% { content: '.'; }
    50% { content: '..'; }
    75% { content: '...'; }
}

.gen-loading-sub {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.7rem;
    color: var(--grey-dark);
    letter-spacing: 0.04em;
}

/* Result area */
.generator-result {
    padding: 1.5rem 1.75rem;
    border-top: 1px solid var(--grey-light);
}

.gen-result-success,
.gen-result-error {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    border-radius: 2px;
    flex-wrap: wrap;
}

.gen-result-success {
    background: rgba(13, 115, 119, 0.06);
    border: 1px solid rgba(13, 115, 119, 0.2);
}

.gen-result-error {
    background: rgba(180, 83, 9, 0.06);
    border: 1px solid rgba(180, 83, 9, 0.2);
}

.gen-result-icon {
    flex-shrink: 0;
    color: var(--teal);
}

.gen-error-icon {
    color: #B45309;
}

.gen-result-info {
    flex: 1;
    min-width: 200px;
}

.gen-result-title {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--charcoal);
    margin-bottom: 0.25rem;
}

.gen-result-meta {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.72rem;
    color: var(--grey-dark);
    letter-spacing: 0.03em;
}

.gen-error-text {
    color: #B45309;
}

.generator-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--teal);
    color: var(--white);
    border: none;
    border-radius: 2px;
    padding: 0.55rem 1.25rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
}

.generator-dl-btn:hover {
    background: var(--teal-dark);
}

/* Shapes reference */
.generator-shapes-ref {
    padding: 1.5rem 1.75rem;
    border-top: 1px solid var(--grey-light);
}

.gen-ref-title {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--grey-dark);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.gen-shapes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
}

.gen-shape-card {
    background: var(--grey-bg);
    border: 1px solid var(--grey-light);
    border-radius: 2px;
    padding: 0.65rem 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.gen-shape-name {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--charcoal);
}

.gen-shape-example {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.65rem;
    color: var(--grey-dark);
    letter-spacing: 0.03em;
}

@media (max-width: 768px) {
    .gen-shapes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .generator-input-area,
    .generator-loading,
    .generator-result,
    .generator-shapes-ref {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    .generator-header {
        padding: 1.25rem 1rem 1rem;
    }
}

@media (max-width: 480px) {
    .gen-shapes-grid {
        grid-template-columns: 1fr 1fr;
    }
    .gen-result-success,
    .gen-result-error {
        flex-direction: column;
        text-align: center;
    }
}

/* ========================================
   Vault — Admin-only file storage
   ======================================== */

/* Vault nav tab — subtle lock icon tint */
.vault-nav-tab {
    gap: 0.45rem;
}
.vault-nav-tab svg {
    opacity: 0.65;
    flex-shrink: 0;
}
.vault-nav-tab.active svg {
    opacity: 1;
}

/* Admin badge */
.vault-status-badge {
    background: rgba(13, 115, 119, 0.1);
    color: var(--teal);
    border: 1px solid rgba(13, 115, 119, 0.2);
    font-family: 'Roboto Mono', monospace;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.3rem 0.7rem;
    border-radius: 1px;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

/* Vault panel — card wrapper */
.vault-panel {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.vault-panel-header {
    padding: 1.75rem 1.75rem 1.25rem;
    border-bottom: 1px solid var(--grey-light);
}

/* Drop zone */
.vault-drop-zone {
    margin: 1.5rem 1.75rem;
    border: 2px dashed var(--grey-mid);
    border-radius: 2px;
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    text-align: center;
    /* Blueprint grid overlay */
    background-image:
        repeating-linear-gradient(0deg, rgba(13,115,119,0.03) 0px, rgba(13,115,119,0.03) 1px, transparent 1px, transparent 30px),
        repeating-linear-gradient(90deg, rgba(13,115,119,0.03) 0px, rgba(13,115,119,0.03) 1px, transparent 1px, transparent 30px);
    background-size: 30px 30px;
    background-color: var(--grey-bg);
}

.vault-drop-zone:hover,
.vault-drop-zone:focus-visible {
    border-color: var(--teal-light);
    background-color: rgba(13, 115, 119, 0.03);
    outline: none;
}

.vault-drop-zone.drag-over {
    border-color: var(--teal);
    background-color: rgba(13, 115, 119, 0.06);
}

.vault-drop-icon {
    width: 40px;
    height: 40px;
    color: var(--teal-light);
    opacity: 0.7;
    margin-bottom: 0.25rem;
}

.vault-drop-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--charcoal);
    margin: 0;
}

.vault-drop-sub {
    font-size: 0.8rem;
    color: var(--grey-dark);
    margin: 0;
}

.vault-browse-btn {
    background: var(--teal);
    color: var(--white);
    border: none;
    border-radius: 2px;
    padding: 0.5rem 1.25rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background-color 0.2s ease;
    margin-top: 0.25rem;
}

.vault-browse-btn:hover {
    background: var(--teal-dark);
}

/* Upload progress */
.vault-progress-wrap {
    margin: 0 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.vault-progress-track {
    height: 4px;
    background: var(--grey-light);
    border-radius: 2px;
    overflow: hidden;
}

.vault-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--teal);
    border-radius: 2px;
    transition: width 0.2s ease;
}

.vault-progress-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.72rem;
    color: var(--grey-dark);
    letter-spacing: 0.04em;
}

/* File list */
.vault-file-list {
    padding: 0 1.75rem 1.75rem;
}

.vault-list-head,
.vault-file-row {
    display: grid;
    grid-template-columns: 1fr 90px 160px 200px;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.75rem;
}

.vault-list-head {
    border-bottom: 1px solid var(--grey-light);
    background: var(--grey-bg);
    border-radius: 1px;
    margin-bottom: 0.25rem;
}

.vault-col {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.7rem;
}

.vault-list-head .vault-col {
    font-weight: 600;
    color: var(--grey-dark);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.vault-file-row {
    border-bottom: 1px solid var(--grey-light);
    transition: background-color 0.15s ease;
}

.vault-file-row:last-child {
    border-bottom: none;
}

.vault-file-row:hover {
    background-color: rgba(13, 115, 119, 0.03);
}

.vault-col-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}

.vault-col-name svg {
    color: var(--teal-light);
    flex-shrink: 0;
}

.vault-filename {
    font-size: 0.82rem;
    color: var(--charcoal);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: 'Roboto Mono', monospace;
}

.vault-col-size {
    font-size: 0.78rem;
    color: var(--grey-dark);
    white-space: nowrap;
}

.vault-col-date {
    font-size: 0.72rem;
    color: var(--grey-dark);
    white-space: nowrap;
}

.vault-col-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.vault-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
    border: 1px solid var(--grey-mid);
    border-radius: 1px;
    padding: 0.3rem 0.6rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.68rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
    white-space: nowrap;
}

.vault-dl-btn {
    color: var(--teal);
    border-color: rgba(13, 115, 119, 0.35);
}

.vault-dl-btn:hover {
    background-color: rgba(13, 115, 119, 0.08);
    border-color: var(--teal);
}

.vault-del-btn {
    color: #B45309;
    border-color: rgba(180, 83, 9, 0.3);
}

.vault-del-btn:hover {
    background-color: rgba(180, 83, 9, 0.07);
    border-color: #B45309;
}

/* Empty state */
.vault-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 3rem 1rem;
    color: var(--grey-dark);
    font-family: 'Roboto Mono', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
}

.vault-empty svg {
    width: 36px;
    height: 36px;
    opacity: 0.35;
}

/* Responsive vault */
@media (max-width: 768px) {
    .vault-list-head,
    .vault-file-row {
        grid-template-columns: 1fr 70px 130px;
    }
    .vault-col-actions {
        grid-column: 1 / -1;
        padding-bottom: 0.25rem;
    }
    .vault-list-head .vault-col-actions {
        display: none;
    }
}

@media (max-width: 480px) {
    .vault-drop-zone {
        margin: 1rem;
        padding: 2rem 1rem;
    }
    .vault-file-list {
        padding: 0 1rem 1.25rem;
    }
    .vault-panel-header {
        padding: 1.25rem 1rem 1rem;
    }
    .vault-progress-wrap {
        margin: 0 1rem 1rem;
    }
    .vault-list-head,
    .vault-file-row {
        grid-template-columns: 1fr 60px;
        padding: 0.5rem 0.5rem;
    }
    .vault-col-date {
        display: none;
    }
    .vault-col-actions {
        grid-column: 1 / -1;
    }
    .vault-list-head .vault-col-actions {
        display: none;
    }
}

/* ========================================
   3D Generator
   ======================================== */

.gen-panel {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.gen-panel-header {
    padding: 1.75rem 1.75rem 1.25rem;
    border-bottom: 1px solid var(--grey-light);
}

.gen-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    min-height: 340px;
}

/* ---- Input column ---- */

.gen-input-col {
    padding: 1.75rem;
    border-right: 1px solid var(--grey-light);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.gen-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--grey-dark);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.gen-textarea {
    width: 100%;
    background: var(--grey-bg);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 0.85rem 1rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.82rem;
    color: var(--charcoal);
    resize: vertical;
    min-height: 88px;
    line-height: 1.6;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    outline: none;
}

.gen-textarea:focus {
    border-color: var(--teal-light);
    background: var(--white);
}

.gen-textarea::placeholder {
    color: var(--grey-mid);
}

/* Example chips */

.gen-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
}

.gen-examples-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.62rem;
    color: var(--grey-dark);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
    margin-right: 0.1rem;
}

.gen-chip {
    background: none;
    border: 1px solid var(--grey-mid);
    border-radius: 1px;
    padding: 0.25rem 0.55rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.67rem;
    color: var(--grey-dark);
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
    white-space: nowrap;
}

.gen-chip:hover {
    border-color: var(--teal-light);
    color: var(--teal);
    background: rgba(13, 115, 119, 0.05);
}

/* Generate button */

.gen-generate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    background: var(--teal);
    color: var(--white);
    border: none;
    border-radius: 2px;
    padding: 0.7rem 1.5rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    margin-top: auto;
}

.gen-generate-btn:hover {
    background: var(--teal-dark);
}

.gen-generate-btn:active {
    transform: scale(0.98);
}

.gen-generate-btn:disabled {
    background: var(--grey-mid);
    cursor: not-allowed;
    transform: none;
}

/* ---- Preview column ---- */

.gen-preview-col {
    background: var(--charcoal);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    /* Blueprint grid overlay */
    background-image:
        repeating-linear-gradient(0deg, rgba(13,115,119,0.07) 0px, rgba(13,115,119,0.07) 1px, transparent 1px, transparent 30px),
        repeating-linear-gradient(90deg, rgba(13,115,119,0.07) 0px, rgba(13,115,119,0.07) 1px, transparent 1px, transparent 30px);
    background-size: 30px 30px;
    background-color: var(--charcoal);
}

/* Corner marks */
.gen-preview-col::before,
.gen-preview-col::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-color: var(--teal);
    border-style: solid;
    opacity: 0.35;
}
.gen-preview-col::before {
    top: 12px; left: 12px;
    border-width: 1px 0 0 1px;
}
.gen-preview-col::after {
    bottom: 12px; right: 12px;
    border-width: 0 1px 1px 0;
}

/* ---- Idle state ---- */

.gen-idle {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
}

.gen-idle-icon {
    width: 72px;
    height: 72px;
    color: var(--teal-light);
    opacity: 0.35;
}

.gen-idle-label {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.72rem;
    color: var(--teal-light);
    letter-spacing: 0.08em;
    opacity: 0.5;
    text-align: center;
}

/* ---- Loading animation ---- */

.gen-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

/* 3D Wireframe Cube */

.gen-cube-scene {
    perspective: 320px;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gen-cube {
    width: 64px;
    height: 64px;
    position: relative;
    transform-style: preserve-3d;
    animation: genCubeSpin 3.2s linear infinite;
}

.gen-cube-face {
    position: absolute;
    width: 64px;
    height: 64px;
    border: 1.5px solid var(--teal-accent);
    background: rgba(13, 115, 119, 0.05);
}

/* Diagonal crosshair lines on each face via pseudo-elements */
.gen-cube-face::before,
.gen-cube-face::after {
    content: '';
    position: absolute;
    background: var(--teal-accent);
    opacity: 0.25;
}
.gen-cube-face::before {
    top: 50%; left: 0; right: 0;
    height: 1px;
    transform: translateY(-50%);
}
.gen-cube-face::after {
    left: 50%; top: 0; bottom: 0;
    width: 1px;
    transform: translateX(-50%);
}

.gen-face-front  { transform: translateZ(32px); }
.gen-face-back   { transform: rotateY(180deg) translateZ(32px); }
.gen-face-right  { transform: rotateY(90deg) translateZ(32px); }
.gen-face-left   { transform: rotateY(-90deg) translateZ(32px); }
.gen-face-top    { transform: rotateX(90deg) translateZ(32px); }
.gen-face-bottom { transform: rotateX(-90deg) translateZ(32px); }

@keyframes genCubeSpin {
    0%   { transform: rotateX(22deg) rotateY(0deg); }
    100% { transform: rotateX(22deg) rotateY(360deg); }
}

.gen-loading-main {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--teal-light);
    letter-spacing: 0.05em;
    text-align: center;
}

.gen-loading-step {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.68rem;
    color: var(--grey-dark);
    letter-spacing: 0.08em;
    text-align: center;
    animation: genStepFade 0.4s ease;
}

@keyframes genStepFade {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Pulsing teal glow behind cube during load */
.gen-loading::before {
    content: '';
    position: absolute;
    width: 90px;
    height: 90px;
    background: radial-gradient(circle, rgba(13,115,119,0.18) 0%, transparent 70%);
    border-radius: 50%;
    animation: genGlowPulse 1.6s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes genGlowPulse {
    from { opacity: 0.4; transform: scale(0.9); }
    to   { opacity: 1;   transform: scale(1.15); }
}

/* ---- Result state ---- */

.gen-result {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.9rem;
    animation: fadeIn 0.35s ease;
}

.gen-result-check {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(13, 115, 119, 0.15);
    border: 1.5px solid var(--teal-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--teal-accent);
}

.gen-result-shape {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--white);
    letter-spacing: 0.03em;
    text-align: center;
}

.gen-result-size {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.68rem;
    color: var(--grey-dark);
    letter-spacing: 0.06em;
    text-align: center;
}

.gen-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--teal);
    color: var(--white);
    text-decoration: none;
    border-radius: 2px;
    padding: 0.55rem 1.25rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    transition: background-color 0.2s ease;
    margin-top: 0.25rem;
}

.gen-dl-btn:hover {
    background: var(--teal-dark);
}

/* ---- Error state ---- */

.gen-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.7rem;
    background: rgba(180, 83, 9, 0.12);
    border: 1px solid rgba(180, 83, 9, 0.3);
    border-radius: 2px;
    padding: 1.25rem 1.5rem;
    color: #F59E0B;
    max-width: 90%;
    animation: fadeIn 0.25s ease;
}

.gen-error svg {
    flex-shrink: 0;
    color: #F59E0B;
}

.gen-error span {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.78rem;
    color: #FCD34D;
    text-align: center;
    line-height: 1.55;
    letter-spacing: 0.02em;
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
    .gen-body {
        grid-template-columns: 1fr;
    }

    .gen-input-col {
        border-right: none;
        border-bottom: 1px solid var(--grey-light);
    }

    .gen-preview-col {
        min-height: 280px;
    }
}

@media (max-width: 480px) {
    .gen-panel-header {
        padding: 1.25rem 1rem 1rem;
    }

    .gen-input-col {
        padding: 1.25rem 1rem;
    }

    .gen-preview-col {
        padding: 1.5rem 1rem;
        min-height: 240px;
    }
}