/* ═══════════════════════════════════════════════════
   ASCII Art Generator — Venus ✨
   Terminal/CRT aesthetic, dark theme
   ═══════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&display=swap');

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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: #0f0f0f;
    --green: #00ff41;
    --green-dim: #00cc33;
    --green-glow: rgba(0, 255, 65, 0.15);
    --green-glow-strong: rgba(0, 255, 65, 0.3);
    --text: #c8c8c8;
    --text-dim: #666666;
    --text-bright: #ffffff;
    --border: #222222;
    --border-hover: #333333;
    --error: #ff4444;
    --accent: #00ff41;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ── CRT Scanline Overlay ────────────────────────── */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.03) 2px,
        rgba(0, 0, 0, 0.03) 4px
    );
}

/* ── Layout ──────────────────────────────────────── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Header ──────────────────────────────────────── */
header {
    padding: 40px 0 20px;
    text-align: center;
    position: relative;
}

.logo {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--green);
    letter-spacing: -1px;
    text-shadow: 0 0 20px var(--green-glow-strong),
                 0 0 40px var(--green-glow);
    margin-bottom: 8px;
    animation: glow-pulse 4s ease-in-out infinite;
}

.logo .cursor {
    animation: blink 1s step-end infinite;
    color: var(--green);
}

@keyframes blink {
    50% { opacity: 0; }
}

@keyframes glow-pulse {
    0%, 100% { text-shadow: 0 0 20px var(--green-glow-strong), 0 0 40px var(--green-glow); }
    50% { text-shadow: 0 0 30px var(--green-glow-strong), 0 0 60px var(--green-glow), 0 0 80px rgba(0, 255, 65, 0.1); }
}

.tagline {
    color: var(--text-dim);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ── Main Grid ───────────────────────────────────── */
.app-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    margin-top: 24px;
    align-items: start;
}

@media (max-width: 900px) {
    .app-grid {
        grid-template-columns: 1fr;
    }
}

/* ── Panel / Card ────────────────────────────────── */
.panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    transition: border-color var(--transition);
}

.panel:hover {
    border-color: var(--border-hover);
}

.panel-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--green);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 500;
}

.panel-header .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 6px var(--green-glow-strong);
    animation: dot-pulse 2s ease-in-out infinite;
}

@keyframes dot-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.panel-body {
    padding: 20px;
}

/* ── Upload Area ─────────────────────────────────── */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    background: var(--bg-secondary);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--green);
    background: rgba(0, 255, 65, 0.03);
    box-shadow: inset 0 0 30px var(--green-glow);
}

.upload-zone.drag-over {
    border-style: solid;
}

.upload-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.7;
}

.upload-text {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.8;
}

.upload-text strong {
    color: var(--green);
    font-weight: 500;
}

.upload-formats {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-top: 8px;
    opacity: 0.6;
}

#file-input {
    display: none;
}

/* ── URL Input ───────────────────────────────────── */
.url-section {
    margin-top: 16px;
}

.url-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.url-divider::before,
.url-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.url-input-wrap {
    display: flex;
    gap: 8px;
}

.url-input-wrap input {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 14px;
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    outline: none;
    transition: border-color var(--transition);
}

.url-input-wrap input:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 2px var(--green-glow);
}

.url-input-wrap input::placeholder {
    color: var(--text-dim);
    opacity: 0.5;
}

/* ── Buttons ─────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    white-space: nowrap;
}

.btn:hover {
    border-color: var(--green);
    color: var(--green);
    background: rgba(0, 255, 65, 0.05);
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--green);
    color: var(--bg-primary);
    border-color: var(--green);
    font-weight: 700;
}

.btn-primary:hover {
    background: var(--green-dim);
    color: var(--bg-primary);
    box-shadow: 0 0 20px var(--green-glow-strong);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.7rem;
}

/* ── Controls ────────────────────────────────────── */
.control-group {
    margin-bottom: 18px;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}

.control-label .value {
    color: var(--green);
    font-weight: 500;
}

/* ── Slider ──────────────────────────────────────── */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--green);
    cursor: pointer;
    box-shadow: 0 0 8px var(--green-glow-strong);
    transition: transform var(--transition), box-shadow var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 16px var(--green-glow-strong);
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--green);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 8px var(--green-glow-strong);
}

/* ── Select ──────────────────────────────────────── */
.custom-select {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 14px;
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition);
    -webkit-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 d='M2 4l4 4 4-4' fill='none' stroke='%23666' stroke-width='1.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.custom-select:focus {
    border-color: var(--green);
}

/* ── Toggle ──────────────────────────────────────── */
.toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.toggle-row + .toggle-row {
    border-top: 1px solid var(--border);
}

.toggle-label {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.toggle {
    position: relative;
    width: 40px;
    height: 22px;
    cursor: pointer;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-track {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--border);
    border-radius: 11px;
    transition: background var(--transition);
}

.toggle input:checked + .toggle-track {
    background: var(--green);
    box-shadow: 0 0 10px var(--green-glow-strong);
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    background: var(--text-bright);
    border-radius: 50%;
    transition: transform var(--transition);
    pointer-events: none;
}

.toggle input:checked ~ .toggle-thumb {
    transform: translateX(18px);
}

/* ── Color Picker ────────────────────────────────── */
.color-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.color-option {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.7rem;
    color: var(--text-dim);
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.color-option:hover {
    border-color: var(--border-hover);
    color: var(--text);
}

.color-option.active {
    border-color: var(--green);
    color: var(--green);
    background: rgba(0, 255, 65, 0.05);
}

.color-swatch {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.color-picker-wrap {
    display: none;
    margin-top: 8px;
}

.color-picker-wrap.visible {
    display: block;
}

.color-picker-wrap input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-secondary);
    cursor: pointer;
    padding: 2px;
}

.color-picker-wrap input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

.color-picker-wrap input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 4px;
}

/* ── Output Area ─────────────────────────────────── */
.output-panel {
    min-height: 400px;
    position: relative;
}

.output-container {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    overflow: auto;
    max-height: 70vh;
    position: relative;
}

.ascii-output {
    font-family: var(--font-mono);
    font-size: 6px;
    line-height: 1.1;
    white-space: pre;
    word-break: keep-all;
    overflow-wrap: normal;
    color: var(--green);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ascii-output.has-content {
    display: block;
}

/* Light background mode */
.ascii-output.light-bg {
    background: #f5f5f5;
    border-radius: 4px;
}

.placeholder-text {
    color: var(--text-dim);
    font-size: 0.85rem;
    text-align: center;
    opacity: 0.5;
}

/* ── Output Actions ──────────────────────────────── */
.output-actions {
    display: flex;
    gap: 8px;
    padding: 12px 0 0;
    flex-wrap: wrap;
}

/* ── Loading State ───────────────────────────────── */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 10, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 16px;
    z-index: 10;
    border-radius: 8px;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--green);
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    animation: loading-blink 1.5s ease-in-out infinite;
}

@keyframes loading-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* ── Error State ─────────────────────────────────── */
.error-message {
    display: none;
    padding: 12px 16px;
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid rgba(255, 68, 68, 0.3);
    border-radius: 6px;
    color: var(--error);
    font-size: 0.8rem;
    margin-top: 12px;
}

.error-message.visible {
    display: block;
}

/* ── Gallery ─────────────────────────────────────── */
.gallery-section {
    margin-top: 24px;
    margin-bottom: 40px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.gallery-item {
    aspect-ratio: 1;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}

.gallery-item:hover {
    border-color: var(--green);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--green-glow);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(0.3);
    transition: filter var(--transition);
}

.gallery-item:hover img {
    filter: grayscale(0);
}

.gallery-item .gallery-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 6px 10px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
    font-size: 0.65rem;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ── Footer ──────────────────────────────────────── */
footer {
    text-align: center;
    padding: 32px 0;
    border-top: 1px solid var(--border);
    margin-top: 40px;
}

footer p {
    color: var(--text-dim);
    font-size: 0.7rem;
    letter-spacing: 1px;
}

footer a {
    color: var(--green);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* ── Toast / Copy Notification ───────────────────── */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--green);
    border-radius: 8px;
    color: var(--green);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 10000;
    box-shadow: 0 4px 20px var(--green-glow);
}

.toast.visible {
    transform: translateY(0);
    opacity: 1;
}

/* ── Typewriter Animation ────────────────────────── */
@keyframes typewriter-cursor {
    50% { border-color: transparent; }
}

.typewriter-active {
    border-right: 2px solid var(--green);
    animation: typewriter-cursor 0.7s step-end infinite;
    padding-right: 2px;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 768px) {
    .logo {
        font-size: 1.6rem;
    }
    
    .tagline {
        font-size: 0.7rem;
    }
    
    header {
        padding: 24px 0 16px;
    }
    
    .app-grid {
        gap: 16px;
        margin-top: 16px;
    }
    
    .panel-body {
        padding: 16px;
    }
    
    .upload-zone {
        padding: 24px 16px;
    }
    
    .color-options {
        gap: 6px;
    }
    
    .color-option {
        padding: 5px 8px;
        font-size: 0.65rem;
    }
    
    .output-actions {
        gap: 6px;
    }
    
    .btn-sm {
        padding: 5px 8px;
        font-size: 0.65rem;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ascii-output {
        font-size: 4px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }
    
    .url-input-wrap {
        flex-direction: column;
    }
    
    .output-actions {
        justify-content: center;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
}

/* ── Scrollbar ───────────────────────────────────── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

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

/* ── Selection ───────────────────────────────────── */
::selection {
    background: var(--green);
    color: var(--bg-primary);
}