:root {
    --bg-color: #0b0f19;
    --card-bg: #161b26;
    --border-color: #2a3245;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --text-color: #f3f4f6;
    --text-muted: #9ca3af;
    --danger-color: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 520px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.logo-container {
    margin-bottom: 16px;
}

.app-logo {
    max-width: 420px; /* Increased from 60px */
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    margin: 0 auto;
    display: block;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

p.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* Navigation Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 12px 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 36px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.02);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.drop-zone-icon {
    font-size: 36px;
    margin-bottom: 10px;
}

.drop-zone-text {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.drop-zone-text strong {
    color: var(--primary-color);
}

/* Text Area Input */
.text-input {
    width: 100%;
    height: 160px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-color);
    padding: 14px;
    font-size: 0.95rem;
    resize: vertical;
    outline: none;
    margin-bottom: 16px;
}

.text-input:focus {
    border-color: var(--primary-color);
}

/* Controls & Buttons */
.link-box {
    display: flex;
    gap: 8px;
    margin-top: 20px;
}

.link-box input {
    flex: 1;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9rem;
}

.btn {
    background: var(--primary-color);
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
    width: 100%;
}

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

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    justify-content: center;
}

.btn-secondary:hover {
    background: #3b4252;
}
/* Photo Action Layout */
.photo-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
}

.btn-block {
    width: 100%;
}

/* Subtle Secondary Action Link */
.btn-link {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    padding: 6px 12px;
    transition: color 0.2s ease, text-decoration 0.2s ease;
}

.btn-link:hover {
    color: var(--text-color);
    text-decoration: underline;
}
/* Viewer Components */
.image-viewer {
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.image-viewer img {
    width: 100%;
    height: auto;
    display: block;
}

.text-viewer {
    margin-top: 20px;
    padding: 16px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    text-align: left;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: monospace;
    max-height: 300px;
    overflow-y: auto;
}

.file-info-box {
    margin-top: 20px;
    padding: 16px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.95rem;
}

.warning-banner {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    padding: 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    margin-bottom: 20px;
}

/* Copy Button Animation & Active State */
.btn {
    transition: background-color 0.25 ease, transform 0.15s ease, color 0.25s ease;
}

.btn.copied {
    background-color: #10b981 !important; /* Emerald Green */
    color: #ffffff;
    transform: scale(1.05);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
}

.app-footer {
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    text-align: left;
    font-size: 0.60rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.app-footer p {
    margin-bottom: 6px;
    display: flex;
    align-items: flex-start;
    gap: 8px; 
}

.app-footer p:last-child {
    margin-bottom: 0;
}
.brand-link {
    text-decoration: none;
    color: inherit;
    display: inline-block;
    transition: opacity 0.2s ease;
}

.brand-link:hover {
    opacity: 0.85;
}