/* ============================================
   QR Code Generator — Geometric Noir
   A dark, precise interface inspired by pixel grids
   ============================================ */

/* --- Custom Properties --- */
:root {
    --bg-void: #0a0a10;
    --bg-primary: #0f0f16;
    --bg-elevated: #1a1a24;
    --bg-card: #1e1e2a;
    --bg-card-hover: #262636;
    --bg-input: #141420;
    --bg-input-focus: #1a1a28;

    --border-subtle: rgba(255, 255, 255, 0.10);
    --border-default: rgba(255, 255, 255, 0.16);
    --border-hover: rgba(255, 255, 255, 0.25);
    --border-active: rgba(0, 229, 200, 0.5);

    --text-primary: #f2f2f8;
    --text-secondary: #b0b0c8;
    --text-muted: #7878a0;
    --text-inverse: #08080b;

    --accent: #00ecd0;
    --accent-bright: #40ffd8;
    --accent-dim: #00c8b0;
    --accent-glow: rgba(0, 236, 208, 0.15);
    --accent-glow-strong: rgba(0, 236, 208, 0.30);

    --danger: #ff5577;
    --danger-hover: #ff7799;
    --danger-bg: rgba(255, 85, 119, 0.14);

    --success-bg: rgba(0, 220, 130, 0.14);
    --success-border: rgba(0, 220, 130, 0.4);
    --success-text: #00e088;

    --font-display: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px 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 var(--accent-glow), 0 0 60px rgba(0, 229, 200, 0.06);

    --transition-fast: 120ms cubic-bezier(0.22, 1, 0.36, 1);
    --transition-base: 250ms cubic-bezier(0.22, 1, 0.36, 1);
    --transition-slow: 450ms cubic-bezier(0.22, 1, 0.36, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--bg-void);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* --- Geometric Grid Background --- */
.grid-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        linear-gradient(var(--border-subtle) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 70%);
}

.grid-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle 600px at 50% 0%, var(--accent-glow) 0%, transparent 70%);
}

/* --- Container --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 1;
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.875rem 0;
    background: rgba(8, 8, 11, 0.7);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid var(--border-subtle);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    display: grid;
    grid-template-columns: repeat(3, 6px);
    grid-template-rows: repeat(3, 6px);
    gap: 3px;
}

.logo-icon span {
    width: 6px;
    height: 6px;
    border-radius: 1px;
}

.logo-icon span:nth-child(odd) { background: var(--accent); }
.logo-icon span:nth-child(even) { background: var(--text-muted); }
.logo-icon span:nth-child(5) { background: var(--accent-bright); }

.logo-text {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.site-header nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.site-header nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.site-header nav a:hover { color: var(--text-primary); }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-accent {
    background: var(--accent);
    color: var(--text-inverse);
    border-color: var(--accent);
    box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn-accent:hover {
    background: var(--accent-bright);
    border-color: var(--accent-bright);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.btn-danger {
    color: var(--danger);
    border-color: rgba(255, 68, 102, 0.2);
    background: var(--danger-bg);
}

.btn-danger:hover {
    background: rgba(255, 68, 102, 0.18);
    border-color: rgba(255, 68, 102, 0.4);
    color: var(--danger-hover);
}

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

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

.btn-sm {
    padding: 0.4rem 0.85rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
}

/* --- Flash Messages --- */
.flash {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    animation: slideDown 0.4s var(--transition-base);
}

.flash-success {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success-text);
}

.flash-error {
    background: var(--danger-bg);
    border: 1px solid rgba(255, 68, 102, 0.3);
    color: var(--danger);
}

.flash-error ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.flash-error ul li::before {
    content: '\2022';
    margin-right: 0.5rem;
    color: var(--danger);
}

/* --- Page Header --- */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2.5rem 0 2rem;
    gap: 1rem;
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    animation: fadeUp 0.6s var(--transition-slow);
}

.empty-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 4px;
    opacity: 0.25;
}

.empty-icon span {
    background: var(--text-muted);
    border-radius: 2px;
}

.empty-state h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

/* --- QR Card Grid --- */
.qr-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    padding-bottom: 3rem;
    animation: fadeUp 0.5s var(--transition-slow);
}

.qr-card {
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.qr-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.qr-card-image {
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-subtle);
    min-height: 140px;
}

.qr-card-image img {
    width: 100px;
    height: 100px;
    image-rendering: pixelated;
    border-radius: var(--radius-sm);
    background: white;
    padding: 6px;
    transition: transform var(--transition-spring);
}

.qr-card:hover .qr-card-image img {
    transform: scale(1.08);
}

.qr-card-body {
    padding: 1.25rem;
    flex: 1;
}

.qr-card-body h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.625rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.qr-card-meta {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: 0.375rem;
}

.qr-card-body time {
    font-size: 0.775rem;
    color: var(--text-secondary);
}

.qr-card-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0.875rem 1.25rem;
    border-top: 1px solid var(--border-subtle);
}

.qr-card-actions .btn {
    flex: 1;
    justify-content: center;
}

.inline-form {
    display: contents;
}

/* --- Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
    border-radius: 6px;
    text-transform: uppercase;
}

.badge-url {
    background: rgba(59, 130, 246, 0.18);
    color: #80bbff;
    border: 1px solid rgba(59, 130, 246, 0.35);
}

.badge-vcard {
    background: rgba(168, 85, 247, 0.18);
    color: #d4a0ff;
    border: 1px solid rgba(168, 85, 247, 0.35);
}

.badge-email {
    background: rgba(251, 146, 60, 0.18);
    color: #ffb060;
    border: 1px solid rgba(251, 146, 60, 0.35);
}

.badge-wifi {
    background: rgba(52, 211, 153, 0.18);
    color: #50eab0;
    border: 1px solid rgba(52, 211, 153, 0.35);
}

.badge-text {
    background: rgba(160, 175, 200, 0.18);
    color: #c0cce0;
    border: 1px solid rgba(160, 175, 200, 0.35);
}

.meta-size {
    font-size: 0.775rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* --- Form Styles --- */
.qr-form {
    max-width: 680px;
    padding-bottom: 3rem;
    animation: fadeUp 0.5s var(--transition-slow);
}

.form-section {
    margin-bottom: 2rem;
}

.form-label {
    display: block;
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    font-family: var(--font-display);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.925rem;
    transition: all var(--transition-fast);
    outline: none;
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:focus {
    background: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow), 0 0 20px var(--accent-glow);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.6;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-col .form-label {
    margin-top: 0;
}

/* --- Type Selector Cards --- */
.type-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
}

.type-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem 0.75rem;
    background: var(--bg-card);
    border: 1.5px solid var(--border-default);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.type-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.type-card-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    transition: all var(--transition-base);
}

.type-card-label {
    font-size: 0.775rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    font-family: var(--font-display);
}

.type-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.type-card.active {
    border-color: var(--accent);
    background: var(--accent-glow);
    box-shadow: 0 0 0 1px var(--accent), var(--shadow-glow);
}

.type-card.active .type-card-icon {
    background: var(--accent);
    color: var(--text-inverse);
}

.type-card.active .type-card-label {
    color: var(--accent-bright);
}

/* --- Field Groups --- */
.field-group {
    display: none;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    animation: fadeIn 0.3s ease;
}

.field-group .form-label {
    margin-top: 1rem;
}

.field-group .form-label:first-child,
.field-group .form-row:first-child .form-label {
    margin-top: 0;
}

.field-group .form-row {
    margin-top: 0;
}

.field-group .form-row + .form-label {
    margin-top: 1rem;
}

/* --- Size Selector --- */
.size-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
}

.size-option {
    cursor: pointer;
}

.size-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.size-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.625rem;
    padding: 1.25rem 0.75rem;
    background: var(--bg-card);
    border: 1.5px solid var(--border-default);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.size-preview::before {
    content: '';
    width: var(--preview-size);
    height: var(--preview-size);
    min-width: 10px;
    min-height: 10px;
    max-width: 40px;
    max-height: 40px;
    background: var(--text-muted);
    border-radius: 3px;
    transition: all var(--transition-base);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 1px;
}

.size-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.size-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.size-option:hover .size-preview {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.size-option input:checked + .size-preview {
    border-color: var(--accent);
    background: var(--accent-glow);
    box-shadow: 0 0 0 1px var(--accent);
}

.size-option input:checked + .size-preview::before {
    background: var(--accent);
}

/* --- Form Actions --- */
.form-actions {
    padding-top: 0.5rem;
}

.form-actions .btn {
    width: 100%;
}

/* --- Detail Layout --- */
.detail-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    padding: 1rem 0 3rem;
    animation: fadeUp 0.5s var(--transition-slow);
}

.qr-display {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    position: relative;
}

.qr-display::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--accent-glow-strong), transparent 50%, var(--accent-glow));
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.qr-display:hover::before {
    opacity: 1;
}

.qr-display img {
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
    border-radius: var(--radius-sm);
    background: white;
    padding: 12px;
    animation: qrReveal 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.detail-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.detail-actions .btn {
    flex: 1;
    justify-content: center;
}

.detail-actions form {
    flex: 1;
    display: flex;
}

.detail-actions form .btn {
    width: 100%;
}

.detail-meta h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.meta-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.meta-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-family: var(--font-display);
}

.meta-section {
    margin-bottom: 1.5rem;
}

.meta-section h3 {
    font-family: var(--font-display);
    font-size: 0.825rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-subtle);
}

.payload-list {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.375rem 1rem;
    font-size: 0.9rem;
}

.payload-list dt {
    color: var(--text-secondary);
    font-weight: 500;
}

.payload-list dd {
    color: var(--text-primary);
    word-break: break-all;
}

.qr-content-preview {
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    padding: 1rem;
    overflow-x: auto;
}

.qr-content-preview code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    white-space: pre-wrap;
    word-break: break-all;
}

/* --- Footer --- */
.site-footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border-subtle);
    margin-top: 2rem;
}

.site-footer p {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* --- Animations --- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes qrReveal {
    from {
        opacity: 0;
        transform: scale(0.85);
        filter: blur(8px);
    }
    to {
        opacity: 1;
        transform: scale(1);
        filter: blur(0);
    }
}

@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 0 20px var(--accent-glow), 0 0 40px rgba(0, 229, 200, 0.05);
    }
    50% {
        box-shadow: 0 0 30px var(--accent-glow-strong), 0 0 60px rgba(0, 229, 200, 0.1);
    }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .type-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .size-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .detail-layout {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .type-selector {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .site-header .container {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}