/* ========================================
   HANABI LENS - Modern Premium UI Design
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

:root {
    /* ダークテーマ - 落ち着いたネイビー系 */
    --bg-primary: #0c1117;
    --bg-secondary: #161b22;
    --bg-card: rgba(255, 255, 255, 0.02);
    --bg-card-hover: rgba(255, 255, 255, 0.04);
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text-primary: #e6edf3;
    --text-secondary: rgba(230, 237, 243, 0.7);
    --text-tertiary: rgba(230, 237, 243, 0.5);
    /* アクセントカラー - 花火をイメージした暖色系 */
    --accent-primary: #f0883e;
    --accent-secondary: #da3633;
    --accent-tertiary: #58a6ff;
    /* グラデーション - 花火の炎をイメージ */
    --gradient-primary: linear-gradient(135deg, #f0883e 0%, #da3633 100%);
    --gradient-accent: linear-gradient(135deg, #ffa657 0%, #f85149 100%);
    --gradient-result: linear-gradient(135deg, #58a6ff 0%, #79c0ff 100%);
    /* シャドウ */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(240, 136, 62, 0.1);
    /* ボーダー半径 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    /* トランジション */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background decoration - 控えめなグロー */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(240, 136, 62, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

/* ========================================
   Header
   ======================================== */
header {
    text-align: center;
    padding: 40px 20px 30px;
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
}

header h1 {
    font-size: 2.5em;
    font-weight: 700;
    letter-spacing: 8px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    text-transform: uppercase;
}

header p {
    font-size: 0.95em;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ========================================
   Result Header (Sticky)
   ======================================== */
.result-header {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 50px;
    padding: 24px 20px;
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.result-item {
    text-align: center;
}

.result-label {
    display: block;
    font-size: 0.75em;
    font-weight: 500;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}

.result-value-container {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.result-value {
    font-size: 3.5em;
    font-weight: 700;
    background: var(--gradient-result);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    letter-spacing: -2px;
}

.result-value.secondary {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-unit {
    font-size: 1.2em;
    font-weight: 500;
    color: var(--text-tertiary);
}

.result-divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, transparent, var(--glass-border), transparent);
}

/* ========================================
   Main Content Grid
   ======================================== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 0;
    min-height: calc(100vh - 300px);
}

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

/* ========================================
   Input Section
   ======================================== */
.input-section {
    padding: 32px 24px;
    border-right: 1px solid var(--glass-border);
    background: var(--bg-secondary);
}

.input-section h2 {
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-section h2::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.input-section h3 {
    font-size: 0.75em;
    font-weight: 600;
    margin: 28px 0 14px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* ========================================
   Form Groups
   ======================================== */
.form-group {
    margin-bottom: 16px;
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.form-group:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.15);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 0.9em;
}

.input-with-value {
    display: flex;
    align-items: center;
    gap: 16px;
}

.input-with-value input[type="range"] {
    flex: 1;
}

.value-display {
    min-width: 80px;
    text-align: right;
    font-weight: 600;
    font-size: 1.1em;
    background: var(--gradient-result);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 数値入力グループ */
.value-input-group {
    display: flex;
    align-items: center;
    gap: 4px;
    min-width: 90px;
}

.value-input-group input[type="number"] {
    width: 70px;
    padding: 6px 8px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--accent-tertiary);
    font-size: 1em;
    font-weight: 600;
    text-align: right;
    -moz-appearance: textfield;
}

.value-input-group input[type="number"]::-webkit-outer-spin-button,
.value-input-group input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.value-input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(240, 136, 62, 0.15);
}

.input-unit {
    color: var(--text-tertiary);
    font-size: 0.9em;
}

/* ========================================
   Custom Range Slider
   ======================================== */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(240, 136, 62, 0.3);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 3px 12px rgba(240, 136, 62, 0.4);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(240, 136, 62, 0.3);
}

/* ========================================
   Custom Select
   ======================================== */
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-size: 0.95em;
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23ffffff60' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
}

.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(240, 136, 62, 0.15);
}

.form-group select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-group small {
    display: block;
    margin-top: 10px;
    color: var(--text-tertiary);
    font-size: 0.8em;
}

/* ========================================
   Orientation Toggle
   ======================================== */
.orientation-toggle {
    display: flex;
    gap: 10px;
}

.orientation-toggle button {
    flex: 1;
    padding: 14px 16px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.orientation-toggle button:hover:not(.active) {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.orientation-toggle button.active {
    background: var(--accent-primary);
    color: white;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(240, 136, 62, 0.25);
}

/* ========================================
   Result Info Box
   ======================================== */
.result-info {
    margin-top: 24px;
    padding: 16px;
    background: rgba(88, 166, 255, 0.06);
    border: 1px solid rgba(88, 166, 255, 0.15);
    border-radius: var(--radius-md);
}

.result-info p {
    margin: 6px 0;
    color: var(--text-secondary);
    font-size: 0.85em;
}

/* ========================================
   Preview Section
   ======================================== */
.preview-section {
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

.preview-section h2 {
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.preview-section h2::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.preview-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

#previewCanvas {
    width: 100%;
    display: block;
}

.preview-info {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.preview-info p {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85em;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.preview-info p:hover {
    background: var(--bg-card-hover);
}

.preview-info span {
    font-weight: 600;
    background: var(--gradient-result);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Ad Banner
   ======================================== */
.ad-banner {
    padding: 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   Stepper (for tube count)
   ======================================== */
.stepper {
    display: flex;
    align-items: center;
    gap: 16px;
}

.stepper button {
    width: 40px;
    height: 40px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1.4em;
    font-weight: 300;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stepper button:hover {
    background: var(--accent-primary);
    border-color: transparent;
}

.stepper button:active {
    transform: scale(0.95);
}

.stepper span {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 900px) {
    .input-section {
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
    }
}

@media (max-width: 600px) {
    header {
        padding: 30px 16px 24px;
    }

    header h1 {
        font-size: 1.8em;
        letter-spacing: 4px;
    }

    .result-header {
        gap: 30px;
        padding: 20px 16px;
    }

    .result-value {
        font-size: 2.5em;
    }

    .result-divider {
        height: 45px;
    }

    .input-section,
    .preview-section {
        padding: 24px 16px;
    }

    .form-group {
        padding: 14px;
    }

    .preview-info {
        gap: 8px;
    }

    .preview-info p {
        padding: 8px 12px;
        font-size: 0.8em;
    }
}

/* ========================================
   Animations - 控えめに
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-group {
    animation: fadeIn 0.4s ease forwards;
}

.form-group:nth-child(1) { animation-delay: 0.03s; }
.form-group:nth-child(2) { animation-delay: 0.06s; }
.form-group:nth-child(3) { animation-delay: 0.09s; }
.form-group:nth-child(4) { animation-delay: 0.12s; }

/* ========================================
   Scrollbar Styling
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ========================================
   Selection Styling
   ======================================== */
::selection {
    background: rgba(240, 136, 62, 0.3);
    color: var(--text-primary);
}