/* ===== CSS Variables - Neo Brutalism ===== */
:root {
    --black: #0a0a0a;
    --black-light: #1a1a1a;
    --black-lighter: #252525;
    --red-dark: #8B0000;
    --red: #B22222;
    --red-bright: #DC143C;
    --gold: #D4AF37;
    --gold-light: #F4D03F;
    --white: #FAFAFA;
    --gray: #888888;
    --gray-dark: #444444;
    --accent: #D4AF37;

    --border-width: 4px;
    --shadow-offset: 6px;
    --shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black);
    --shadow-gold: var(--shadow-offset) var(--shadow-offset) 0 var(--gold);
    --shadow-red: var(--shadow-offset) var(--shadow-offset) 0 var(--red-dark);

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --container-width: 1400px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--black);
    color: var(--white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* ===== Container ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: var(--black);
    border-bottom: var(--border-width) solid var(--white);
    padding: 16px 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { display: flex; align-items: center; }

.logo-img {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.nav-link {
    padding: 10px 20px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: var(--border-width) solid transparent;
    transition: all 0.15s ease;
}

.nav-link:hover {
    background: var(--white);
    color: var(--black);
    border-color: var(--white);
}

/* ===== Main ===== */
.main {
    flex: 1;
    padding: 120px 0 60px;
}

/* ===== Page Header ===== */
.page-header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 40px;
}

.page-icon {
    width: 80px;
    height: 80px;
    background: var(--red-dark);
    border: var(--border-width) solid var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 4px 4px 0 var(--gold);
    flex-shrink: 0;
}

.page-icon svg {
    width: 40px;
    height: 40px;
    color: var(--white);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 8px;
}

.page-description {
    color: var(--gray);
    font-size: 1.1rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: var(--border-width) solid var(--white);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn svg { width: 18px; height: 18px; }

.btn-primary {
    background: var(--red-dark);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-primary:active {
    background: var(--red);
    box-shadow: 2px 2px 0 var(--black);
    transform: translate(4px, 4px);
}

.btn-primary:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--gold);
}

.btn-secondary {
    background: var(--black-light);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-secondary:active {
    box-shadow: 2px 2px 0 var(--black);
    transform: translate(4px, 4px);
}

.btn-secondary:hover {
    background: var(--black-lighter);
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--gold);
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.85rem;
}

/* ===== Mode Switcher ===== */
.mode-switcher {
    display: flex;
    gap: 0;
    margin-bottom: 32px;
}

.mode-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 24px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: var(--border-width) solid var(--white);
    background: var(--black-light);
    color: var(--gray);
    cursor: pointer;
    transition: all 0.15s ease;
}

.mode-btn:first-child { border-right: none; }

.mode-btn svg {
    width: 22px;
    height: 22px;
}

.mode-btn.active {
    background: var(--red-dark);
    color: var(--white);
    box-shadow: var(--shadow);
}

.mode-btn:not(.active):hover {
    background: var(--black-lighter);
    color: var(--white);
}

/* ===== Upload Panel ===== */
.upload-panel {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}

.upload-panel.hidden { display: none; }

.drop-zone {
    border: 3px dashed var(--gray-dark);
    border-radius: 4px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--gold);
    background: rgba(212, 175, 55, 0.05);
}

.drop-icon {
    width: 48px;
    height: 48px;
    color: var(--gray);
    margin-bottom: 16px;
    transition: color 0.3s ease;
}

.drop-zone:hover .drop-icon,
.drop-zone.dragover .drop-icon {
    color: var(--gold);
}

.drop-text {
    font-size: 1.2rem;
    color: var(--gray);
    margin-bottom: 24px;
}

.hidden-input { display: none; }
.hidden { display: none !important; }

/* ===== Results Toolbar ===== */
.results-toolbar {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    padding: 16px 24px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.results-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-name {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--gray);
}

.badge {
    background: var(--red-dark);
    color: var(--white);
    padding: 4px 12px;
    font-weight: 600;
    font-size: 0.8rem;
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 2px solid var(--white);
}

.results-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.helper-text {
    font-size: 0.85rem;
    color: var(--gray);
    margin-bottom: 16px;
}

/* ===== Progress Bar ===== */
.progress-bar {
    background: var(--black);
    border: 2px solid var(--gray-dark);
    height: 36px;
    position: relative;
    margin-bottom: 24px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--red-dark);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
}

/* ===== Pages Grid ===== */
.pages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.page-card {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.15s ease;
}

.page-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--gold);
}

.page-thumb {
    background: var(--black);
    border-bottom: 2px solid var(--gray-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    min-height: 200px;
    /* Checkerboard */
    background-image:
        linear-gradient(45deg, #111 25%, transparent 25%),
        linear-gradient(-45deg, #111 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #111 75%),
        linear-gradient(-45deg, transparent 75%, #111 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.page-thumb img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
}

.page-card-footer {
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-label {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
}

.btn-download-page {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: 2px solid var(--gray-dark);
    color: var(--gray);
    padding: 8px 14px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-download-page svg { width: 14px; height: 14px; }

.btn-download-page:hover {
    border-color: var(--gold);
    color: var(--gold);
    background: rgba(212, 175, 55, 0.1);
}

/* ===== Image Preview Grid (img to pdf) ===== */
.img-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.img-card {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    box-shadow: var(--shadow);
    overflow: hidden;
    position: relative;
    cursor: grab;
    transition: all 0.15s ease;
}

.img-card:active { cursor: grabbing; }

.img-card.dragging {
    opacity: 0.5;
    border-color: var(--gold);
}

.img-card .page-thumb {
    min-height: 140px;
}

.img-card .page-thumb img {
    max-height: 180px;
}

.img-card-footer {
    padding: 10px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.img-card-name {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--gray);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 120px;
}

.img-card-order {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.8rem;
    background: var(--red-dark);
    color: var(--white);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--white);
}

.btn-remove-img {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    background: var(--red-dark);
    border: 2px solid var(--white);
    color: var(--white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s;
}

.img-card:hover .btn-remove-img { opacity: 1; }

.btn-remove-img svg { width: 14px; height: 14px; }

.btn-remove-img:hover { background: var(--red-bright); }

/* ===== Footer ===== */
.footer {
    background: var(--red-dark);
    border-top: var(--border-width) solid var(--white);
    padding: 30px 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    height: 36px;
    width: auto;
    object-fit: contain;
}

.footer-copy {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--gray-dark); border: 2px solid var(--black); }
::-webkit-scrollbar-thumb:hover { background: var(--gray); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .page-header {
        flex-direction: column;
        text-align: center;
    }

    .page-title { font-size: 2rem; }

    .mode-switcher { flex-direction: column; }
    .mode-btn:first-child { border-right: var(--border-width) solid var(--white); border-bottom: none; }

    .results-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .results-info { justify-content: center; }

    .results-actions {
        flex-direction: column;
    }

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

    .img-preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .btn { justify-content: center; }
}