/* Common styles for all pages */
:root {
    --body-bg: #ffffff;
    --header-bg: #d8d8d8;
    --header-text: #333333;
    --dialog-bg: #ffffff;
    --dialog-text: #333333;
    --dialog-text-secondary: #666666;
    --dialog-btn-color: #00897b;
}

[data-theme="dark"] {
    --body-bg: #1a1a1a;
    --header-bg: #252525;
    --header-text: #e0e0e0;
    --dialog-bg: #2d2d2d;
    --dialog-text: #e0e0e0;
    --dialog-text-secondary: #b0b0b0;
    --dialog-btn-color: #26a69a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
    background: var(--body-bg);
    height: 100vh; /* fallback */
    height: 100dvh; /* modern browsers */
    height: calc(var(--vh, 1vh) * 100); /* JavaScript-calculated fallback for PWA */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding-bottom: env(safe-area-inset-bottom);
    transition: background-color 0.3s ease;
}

/* Header styles */
.header {
    background: var(--header-bg);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    transition: background-color 0.3s ease;
}

.close-btn {
    font-size: 28px;
    color: var(--header-text);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    transition: color 0.3s ease;
}

/* Material Icons button style */
.icon-btn,
.palette-btn,
.share-btn,
.help-btn {
    font-family: 'Material Symbols Outlined';
    font-size: 24px;
    color: var(--header-text);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    transition: color 0.3s ease;
}

/* Dialog styles */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.dialog-overlay.show {
    display: flex;
}

.dialog {
    background: var(--dialog-bg);
    padding: 24px;
    max-width: 320px;
    width: 90%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: background-color 0.3s ease;
}

.dialog-content {
    text-align: center;
}

.dialog-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--dialog-text);
    transition: color 0.3s ease;
}

.dialog-text {
    font-size: 14px;
    color: var(--dialog-text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
    text-align: center;
    transition: color 0.3s ease;
}

.dialog-btn {
    background: none;
    border: none;
    color: var(--dialog-btn-color);
    font-size: 16px;
    font-weight: 600;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.2s ease;
}