/* ========================================
   共通スタイル (common.css)
   ヘッダー・フッター・ベーススタイル
======================================== */

/* CSS変数 */
:root {
    --color-primary: #6467f2;
    --color-background-light: #f6f6f8;
    --color-background-dark: #101122;
    --color-text-primary: #111118;
    --color-text-secondary: #616289;
    --color-border: #dbdbe6;
    --color-white: #ffffff;
    --color-emerald: #10b981;
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-full: 9999px;
}

/* ダークモード変数 */
.dark {
    --color-background: var(--color-background-dark);
    --color-text: var(--color-white);
    --color-border: #1f2937;
    --color-card-bg: #111827;
}

.light {
    --color-background: var(--color-background-light);
    --color-text: var(--color-text-primary);
    --color-card-bg: var(--color-white);
}

/* リセット・ベース */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    min-height: 100dvh;
    background-color: #ffffff;
    color: var(--color-text-primary);
    line-height: 1.5;
}

/* スマホ風コンテナ */
.app-container {
    max-width: 28rem;
    margin: 0 auto;
    min-height: 100dvh;
    background-color: #ffffff;
    position: relative;
}

.dark .app-container {
    background-color: var(--color-background-dark);
}

.dark body {
    background-color: var(--color-background-dark);
    color: var(--color-white);
}

/* マテリアルアイコン設定 */
.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* ========================================
   ヘッダー
======================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.dark .header {
    background-color: rgba(16, 17, 34, 0.8);
    border-bottom-color: #1f2937;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
}

.header-title {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--color-text-primary);
    flex: 1;
}

.dark .header-title {
    color: var(--color-white);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.header-icon-btn {
    display: flex;
    width: 2.5rem;
    height: 2.5rem;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-full);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

.header-icon-btn:hover {
    background-color: #f3f4f6;
}

.dark .header-icon-btn:hover {
    background-color: #1f2937;
}

.header-icon-btn .material-symbols-outlined {
    color: var(--color-text-primary);
}

.dark .header-icon-btn .material-symbols-outlined {
    color: var(--color-white);
}

/* タブナビゲーション */
.section-tabs {
    padding: 0 1rem;
    overflow-x: auto;
}

.section-tabs::-webkit-scrollbar {
    display: none;
}

.section-tabs-inner {
    display: flex;
    gap: 2rem;
    min-width: max-content;
}

.section-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0 0.75rem;
    border-bottom: 3px solid transparent;
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: color 0.2s, border-color 0.2s;
}

.section-tab:hover {
    color: var(--color-primary);
}

.section-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.dark .section-tab {
    color: #9ca3af;
}

.dark .section-tab.active {
    color: var(--color-primary);
}

.section-tab-text {
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.015em;
}

/* ========================================
   フッター（下部ナビゲーション）
======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 28rem;
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0.5rem 0 env(safe-area-inset-bottom, 1.5rem);
    padding-bottom: max(1.5rem, env(safe-area-inset-bottom));
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--color-border);
}

.dark .bottom-nav {
    background-color: rgba(16, 17, 34, 0.9);
    border-top-color: #1f2937;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    text-decoration: none;
    color: var(--color-text-secondary);
    cursor: pointer;
}

.dark .nav-item {
    color: #9ca3af;
}

.nav-item.active {
    color: var(--color-primary);
}

.nav-item .material-symbols-outlined {
    font-size: 1.5rem;
}

.nav-item-label {
    font-size: 0.625rem;
    font-weight: 700;
}

/* 中央の追加ボタン */
.nav-item-add {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.nav-add-btn {
    width: 3rem;
    height: 3rem;
    border-radius: var(--border-radius-full);
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: -2rem;
    box-shadow: 0 10px 15px -3px rgba(100, 103, 242, 0.4);
    border: none;
    cursor: pointer;
    transition: transform 0.2s;
}

.nav-add-btn:hover {
    transform: scale(1.05);
}

.nav-add-btn .material-symbols-outlined {
    font-size: 1.875rem;
    color: var(--color-white);
}

.nav-add-label {
    font-size: 0.625rem;
    font-weight: 700;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.dark .nav-add-label {
    color: #9ca3af;
}