:root {
    --font-sans: "Inter", "Outfit", "Segoe UI", system-ui, -apple-system, sans-serif;
    --bg: #ffffff;
    --bg-elevated: #f9f9f9;
    --surface: #ffffff;
    --surface-soft: #fcfcfc;
    --border: #e0e0e0;
    --border-strong: #111111;
    --text: #111111;
    --text-muted: #777777;
    --accent: #e61919;
    --accent-hover: #cc0000;
    --accent-soft: rgba(230, 25, 25, 0.08);
    --success: #1a744e;
    --danger: #cf222e;
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-focus: 0 0 0 3px rgba(230, 25, 25, 0.15);
    --radius-lg: 2px;
    --radius-md: 2px;
    --radius-sm: 2px;
    --duration: 150ms;
}

:root[data-theme="dark"] {
    --bg: #0a0a0a;
    --bg-elevated: #1a1a1a;
    --surface: #111111;
    --surface-soft: #141414;
    --border: #333333;
    --border-strong: #ffffff;
    --text: #f0f0f0;
    --text-muted: #999999;
    --accent: #ff3333;
    --accent-hover: #ff5555;
    --accent-soft: rgba(255, 51, 51, 0.15);
    --success: #3fb950;
    --danger: #f85149;
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-focus: 0 0 0 3px rgba(255, 51, 51, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    position: relative;
    overflow-x: hidden;
    padding-bottom: 60px;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Typography & Brutalism Layer */
h1, h2, h3, h4, h5, h6 {
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--text);
}

p {
    color: var(--text-muted);
}

/* Custom Header with Japan Sun Motif */
header {
    margin-bottom: 60px;
    position: relative;
}

.minimalist-logo {
    font-size: 5rem;
    line-height: 0.9;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 15px;
}

.logo-text {
    background: none;
    -webkit-text-fill-color: var(--text);
}

.red-sun {
    width: 60px;
    height: 60px;
    background: var(--accent);
    border-radius: 50%;
    display: inline-block;
}

.header-subtitle {
    margin-top: 15px;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.creator-badge {
    margin-top: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
}

.creator-twitter {
    color: var(--text);
    text-decoration: none;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 2px;
}

/* Feature Image Blocks */
.editorial-hero {
    margin-bottom: 40px;
    width: 100%;
    height: 400px;
    position: relative;
    overflow: hidden;
    border: 2px solid var(--border-strong);
}

.editorial-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(20%) contrast(1.1);
}

.feature-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.feature-split img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 300px;
    border: 2px solid var(--border-strong);
}

/* UI Sections */
.input-section,
.output-section,
.variants-section,
.quote-section,
.extension-section,
.faq-section {
    background: var(--bg);
    border: 2px solid var(--border-strong);
    padding: 30px;
    margin-bottom: 30px;
    border-radius: 0;
    position: relative;
}

.input-section::before {
    content: "APP/01";
    position: absolute;
    top: -12px;
    left: 20px;
    background: var(--bg);
    padding: 0 10px;
    font-weight: 800;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

input, textarea, select {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-elevated);
    color: var(--text);
    border: 2px solid var(--border);
    border-radius: 0;
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--duration) ease;
    font-family: var(--font-sans);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--border-strong);
    background: var(--bg);
    box-shadow: 4px 4px 0 var(--border-strong);
}

/* Buttons */
.button-group, .reply-actions {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 24px;
    border-radius: 0;
    font-size: 0.9rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--duration) ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 2px solid var(--border-strong);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--border);
    color: var(--text-muted);
}

.btn-primary, .btn-extension {
    background: var(--accent);
    color: #fff;
    border-color: var(--border-strong);
}

.btn-primary:hover:not(:disabled), .btn-extension:hover {
    background: var(--text);
    color: var(--bg);
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--accent);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg);
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--border-strong);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border-color: var(--accent);
}

.btn-outline:hover:not(:disabled) {
    background: var(--accent);
    color: white;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--border-strong);
}

/* Output Boxes */
.analysis-box, .reply-box, .quote-box {
    background: var(--bg-elevated);
    border: 2px solid var(--border-strong);
    border-left: 6px solid var(--accent);
    padding: 20px;
    margin: 15px 0;
    font-size: 1.1rem;
    line-height: 1.6;
}

.variants-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.variant-item {
    padding: 20px;
    border: 2px solid var(--border-strong);
}

.quote-preview {
    border: 2px solid var(--border-strong);
    padding: 20px;
    margin: 20px 0;
}

.quote-header {
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 10px;
    margin-bottom: 15px;
    font-weight: 800;
    text-transform: uppercase;
}

/* Checkbox */
.checkbox-group {
    display: flex;
    align-items: center;
    height: 100%;
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.checkbox-label input {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
}

/* Toggle */
.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    width: 44px;
    height: 44px;
    border: 2px solid var(--border-strong);
    background: var(--bg);
    color: var(--text);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--duration) ease;
}

.theme-toggle:hover {
    background: var(--border-strong);
    color: var(--bg);
}

/* Status Elements */
.loading { text-align: center; padding: 30px; font-weight: 800; text-transform: uppercase; }
.spinner { width: 40px; height: 40px; border: 4px solid var(--border); border-top: 4px solid var(--accent); border-radius: 50%; animation: spin 1s infinite linear; margin: 0 auto 15px; }

.error { background: var(--bg); border: 2px solid var(--danger); border-left: 6px solid var(--danger); padding: 15px; margin: 15px 0; font-weight: 700; }
.success { background: var(--bg); border: 2px solid var(--success); border-left: 6px solid var(--success); padding: 15px; margin: 15px 0; font-weight: 700; }

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

/* Extension Section */
.extension-features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 30px 0; }
.feature { border: 2px solid var(--border-strong); padding: 20px; }
.feature h4 { margin-top: 10px; margin-bottom: 5px; }

/* FAQ Section */
.faq-container { display: flex; flex-direction: column; gap: -2px; }
.faq-item { border: 2px solid var(--border-strong); margin-bottom: -2px; }
.faq-question { padding: 20px; font-weight: 800; cursor: pointer; display: flex; align-items: center; list-style: none; }
.faq-question::-webkit-details-marker { display: none; }
.faq-icon { margin-right: 15px; color: var(--accent); }
.faq-arrow { margin-left: auto; color: var(--accent); }
.faq-answer { padding: 20px; border-top: 2px solid var(--border-strong); background: var(--bg-elevated); }

@media (max-width: 768px) {
    .form-row, .feature-split, .extension-features { grid-template-columns: 1fr; }
    .minimalist-logo { font-size: 3rem; }
    .red-sun { width: 35px; height: 35px; }
}