/* ============================================
   PDF TOOLKIT — Premium Dark Theme Stylesheet
   ============================================ */

/* === CSS Variables === */
:root {
    --bg-primary: #07070e;
    --bg-secondary: #0d0d18;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --bg-glass: rgba(15, 15, 30, 0.7);
    --bg-input: rgba(255, 255, 255, 0.05);

    --text-primary: #e8ecf4;
    --text-secondary: #8b95a8;
    --text-muted: #5a6378;

    --accent-violet: #a78bfa;
    --accent-cyan: #22d3ee;
    --accent-emerald: #34d399;
    --accent-rose: #fb7185;

    --gradient-primary: linear-gradient(135deg, #a78bfa, #6366f1, #06b6d4);
    --gradient-accent: linear-gradient(135deg, #7c3aed, #06b6d4);
    --gradient-success: linear-gradient(135deg, #10b981, #06b6d4);
    --gradient-warm: linear-gradient(135deg, #f472b6, #a78bfa);

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(167, 139, 250, 0.3);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* === Ambient Background === */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: #7c3aed;
    top: -10%;
    left: -5%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: #06b6d4;
    top: 50%;
    right: -10%;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: #6366f1;
    bottom: -10%;
    left: 30%;
    animation-delay: -14s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 30px) scale(1.02); }
}

/* === Header === */
.header {
    position: relative;
    z-index: 10;
    padding: 2.5rem 1.5rem 1rem;
    text-align: center;
}

.header-content {
    max-width: 700px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 0.5rem;
}

.logo-icon {
    display: flex;
    align-items: center;
    animation: logoSpin 8s linear infinite;
}

@keyframes logoSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
}

/* === Tab Navigation === */
.tab-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.75rem 1rem;
    background: rgba(7, 7, 14, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.tab-nav-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 4px;
    border: 1px solid var(--border-subtle);
}

.tab-btn {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.65rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    flex: 1;
    white-space: nowrap;
}

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

.tab-btn.active {
    color: var(--text-primary);
}

.tab-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.tab-indicator {
    position: absolute;
    z-index: 1;
    height: calc(100% - 8px);
    border-radius: var(--radius-md);
    background: var(--bg-card-hover);
    border: 1px solid var(--border-hover);
    transition: all var(--transition-slow);
    top: 4px;
    box-shadow: var(--shadow-glow);
}

/* === Main Content === */
.main-content {
    position: relative;
    z-index: 10;
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem 1rem 4rem;
}

/* === Tool Section === */
.tool-section {
    display: none;
    animation: fadeIn 0.4s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    max-width: 500px;
    margin: 0 auto;
}

/* === Upload Zone === */
.upload-zone {
    position: relative;
    border: 2px dashed var(--border-hover);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-card);
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: inherit;
}

.upload-zone:hover {
    border-color: var(--accent-violet);
    background: var(--bg-card-hover);
}

.upload-zone:hover::before {
    opacity: 0.03;
}

.upload-zone.drag-over {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.05);
    transform: scale(1.01);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.1);
}

.upload-zone.drag-over::before {
    opacity: 0.06;
}

.upload-zone-content {
    position: relative;
    z-index: 2;
}

.upload-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    color: var(--text-muted);
    transition: color var(--transition-base), transform var(--transition-base);
}

.upload-zone:hover .upload-icon {
    color: var(--accent-violet);
    transform: translateY(-2px);
}

.upload-text {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.upload-subtext {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* === Preview Section === */
.preview-section {
    margin-top: 1.5rem;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.preview-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.drag-hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* === Image Grid === */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.image-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
    cursor: grab;
    aspect-ratio: 3/4;
}

.image-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.image-card.dragging {
    opacity: 0.4;
    transform: scale(0.95);
}

.image-card.drag-over-card {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.image-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    padding: 0.5rem;
}

.image-card:hover .image-card-overlay {
    opacity: 1;
}

.image-card-number {
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(0,0,0,0.5);
    padding: 2px 8px;
    border-radius: 4px;
}

.image-card-actions {
    display: flex;
    gap: 4px;
}

.image-card-btn {
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    transition: all var(--transition-fast);
    backdrop-filter: blur(8px);
}

.image-card-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.image-card-btn.delete-btn:hover {
    background: rgba(251, 113, 133, 0.6);
}

/* Page card for PDF to JPG */
.page-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
}

.page-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.page-card-img {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: contain;
    background: #111;
    display: block;
}

.page-card-footer {
    padding: 0.6rem 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border-subtle);
}

.page-card-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.page-card-download {
    padding: 4px 10px;
    border: none;
    border-radius: 6px;
    background: var(--gradient-accent);
    color: white;
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-family);
    transition: all var(--transition-fast);
}

.page-card-download:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 12px rgba(124, 58, 237, 0.3);
}

/* === PDF Info Card === */
.pdf-info-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    margin-top: 1.25rem;
    animation: fadeIn 0.3s ease;
}

.pdf-info-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: rgba(167, 139, 250, 0.1);
    color: var(--accent-violet);
    flex-shrink: 0;
}

.pdf-info-icon svg {
    width: 22px;
    height: 22px;
}

.pdf-info-details {
    flex: 1;
    min-width: 0;
}

.pdf-info-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pdf-info-meta {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* === Options Bar === */
.options-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.5rem;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    animation: fadeIn 0.3s ease;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    min-width: 150px;
}

.option-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.option-select {
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b95a8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

.option-select:focus {
    border-color: var(--accent-violet);
    box-shadow: 0 0 0 2px rgba(167, 139, 250, 0.15);
}

.option-select option {
    background: #1a1a2e;
    color: var(--text-primary);
}




/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-accent);
    color: white;
    box-shadow: 0 2px 15px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 25px rgba(124, 58, 237, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

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

.btn-ghost:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.btn-lg {
    padding: 0.8rem 2rem;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 0.35rem 0.6rem;
    font-size: 0.78rem;
}

/* === Action Bar === */
.action-bar {
    display: flex;
    justify-content: center;
    margin-top: 1.5rem;
    animation: fadeIn 0.3s ease;
}

/* === Progress === */
.progress-container {
    margin-top: 1.5rem;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    animation: fadeIn 0.3s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.progress-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-pct {
    font-size: 0.85rem;
    color: var(--accent-violet);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.progress-bar-track {
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    width: 0%;
    height: 100%;
    background: var(--gradient-accent);
    border-radius: 3px;
    transition: width 0.3s ease;
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}




/* === Toast === */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    background: rgba(15, 15, 30, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    animation: toastIn 0.4s ease;
    min-width: 250px;
    max-width: 380px;
}

.toast.toast-out {
    animation: toastOut 0.3s ease forwards;
}

.toast-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.toast-success { border-left: 3px solid var(--accent-emerald); }
.toast-error { border-left: 3px solid var(--accent-rose); }
.toast-info { border-left: 3px solid var(--accent-cyan); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(40px); }
}

/* === Modal === */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: modalFadeIn 0.3s ease;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.modal-image {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: var(--bg-glass);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-hover);
}

.modal-close:hover {
    background: var(--accent-rose);
    border-color: var(--accent-rose);
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* === Footer === */
.footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: 0.78rem;
    border-top: 1px solid var(--border-subtle);
}

/* ================================
   Responsive
   ================================ */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem 0.75rem;
    }

    .logo-text {
        font-size: 1.4rem;
    }

    .tagline {
        font-size: 0.82rem;
    }

    .tab-btn span {
        display: none;
    }

    .tab-btn {
        padding: 0.6rem 1rem;
    }

    .tab-icon {
        width: 22px;
        height: 22px;
    }

    .tool-title {
        font-size: 1.25rem;
    }

    .upload-zone {
        padding: 2rem 1.25rem;
    }

    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 0.75rem;
    }


    .options-bar {
        flex-direction: column;
    }

    .option-group {
        min-width: unset;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem 0.75rem 3rem;
    }

    .image-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .preview-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn-lg {
        width: 100%;
    }

    .action-bar {
        flex-direction: column;
    }

    .toast-container {
        left: 0.75rem;
        right: 0.75rem;
    }

    .toast {
        min-width: unset;
        max-width: unset;
    }
}