/* ===== CSS Variables ===== */
:root {
    /* Default Color Palette */
    --color-a: #0066B8;
    --color-b: #FFFFFF;
    --color-c: #005A9E;

    /* UI Colors */
    --bg-primary: #F5F5F5;
    --bg-secondary: #FFFFFF;
    --bg-card: rgba(255, 255, 255, 0.9);
    --text-primary: #222222;
    --text-secondary: #666666;
    --border-color: #E0E0E0;

    /* Accent Colors */
    --accent-red: #E74C3C;
    --accent-yellow: #F1C40F;
    --accent-blue: #3498DB;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

/* ===== Global Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #F5F7FA 0%, #E8EBF0 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Header ===== */
.main-header {
    background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    position: relative;
    border-bottom: 3px solid var(--color-a);
}

.header-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.main-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.logo {
    position: absolute;
    top: -50px;
    right: var(--spacing-xl);
    background: transparent;
}

.logo-image {
    height: 180px;
    width: auto;
    display: block;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===== Main Container ===== */
.main-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    max-width: 1600px;
    margin: 0 auto;
}

/* ===== Sidebar ===== */
.sidebar {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
}

.sidebar-section {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.sidebar-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

/* Pattern Selector */
.pattern-selector {
    margin-bottom: var(--spacing-md);
}

.pattern-selector label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.pattern-select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pattern-select:focus {
    outline: none;
    border-color: var(--color-a);
    box-shadow: 0 0 0 3px rgba(0, 102, 184, 0.1);
}

/* Pattern Info */
.pattern-info {
    background: #F9FAFB;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.color-preview-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.color-preview-item:last-child {
    margin-bottom: 0;
}

.color-label {
    font-weight: 600;
    font-size: 0.875rem;
    min-width: 20px;
}

.color-box {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    flex-shrink: 0;
}

.color-code {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Buttons */
.btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.btn:last-child {
    margin-bottom: 0;
}

.btn-icon {
    font-size: 1.125rem;
    font-weight: 700;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-a) 0%, var(--color-b) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--color-a);
    color: var(--color-a);
}

.btn-danger {
    background: var(--accent-red);
    color: white;
}

.btn-danger:hover {
    background: #C0392B;
}



/* ===== Content Area ===== */
.content-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Section */
.section {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.section-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-a);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.section-header p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}



/* ===== Preview Container =====*/
.preview-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

/* Website Preview (Left Side) */
.website-preview {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

/* Upper Block (Left: A, Right: B) */
.preview-upper-block {
    position: relative;
    background: linear-gradient(90deg, var(--color-a) 0%, var(--color-b) 100%);
    min-height: 300px;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.block-label {
    color: white;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

/* Middle Spacer */
.middle-spacer {
    background: #F2F2F2;
    min-height: 100px;
}

/* Lower Block (C) */
.preview-lower-block {
    background: var(--color-c);
    min-height: 150px;
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: flex-start;
    transition: background-color 0.3s ease;
}

/* Note */
.note {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
}



/* ===== Responsive Utilities ===== */
.sp-only {
    display: none;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }

    .preview-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main-header h1 {
        font-size: 1.5rem;
    }

    .logo {
        position: static;
        margin-top: var(--spacing-sm);
    }

    .header-content {
        flex-direction: column;
    }

    .color-palette-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    }

    .preview-upper {
        grid-template-columns: 1fr;
    }

    /* SP表示時のカラー適用ルール調整 */
    .rules-description {
        padding: var(--spacing-sm);
    }

    .rule-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: var(--spacing-md);
    }

    .rule-icon {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-xs);
    }

    .rule-content h4 {
        font-size: 1rem;
    }

    .rule-content h4 small {
        font-size: 0.7rem;
    }

    /* SP表示時のみ改行 */
    .sp-only {
        display: inline;
    }

    /* SP表示時のブロックラベル調整 */
    .block-label {
        font-size: 0.75rem;
        line-height: 1.4;
        white-space: normal;
        word-break: keep-all;
        padding: 0 var(--spacing-xs);
    }
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #F0F0F0;
}

::-webkit-scrollbar-thumb {
    background: var(--color-a);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0052A3;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.5s ease-out;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.color-item.selected {
    animation: pulse 1.5s ease-in-out infinite;
}

/* ===== Color Palette Gallery ===== */
.palette-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.palette-card {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

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

.palette-card.selected {
    border-color: var(--color-a);
    box-shadow: var(--shadow-md);
}

.palette-card-header {
    margin-bottom: var(--spacing-sm);
}

.palette-card-number {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.palette-card-font {
    font-size: 0.625rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.palette-card-colors {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.palette-color-box {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.palette-card-codes {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.palette-code-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.625rem;
}

.palette-code-label {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 12px;
}

.palette-code-value {
    font-family: 'Courier New', monospace;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Responsive adjustments for gallery */
@media (max-width: 1200px) {
    .palette-gallery {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    .palette-gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

/* ===== Tip Section ===== */
.tip-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
}

.tip-box {
    background: white;
    border: 3px solid var(--color-a);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.tip-box p {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Responsive adjustments for tip section */
@media (max-width: 768px) {
    .tip-box {
        padding: var(--spacing-md);
    }

    .tip-box p {
        font-size: 0.875rem;
    }
}