/* ======================
   基本設定とリセット
====================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーテーマ */
    --primary-color: #de6171;
    --primary-dark: #c54d60;
    --secondary-color: #FFC107;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --error-color: #F44336;

    /* ニュートラルカラー */
    --text-primary: #212121;
    --text-secondary: #757575;
    --background-primary: #fafafa;
    --background-secondary: #ffffff;
    --border-color: #e0e0e0;
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 16px rgba(0,0,0,0.2);

    /* サイズ */
    --header-height: 80px;
    --sidebar-width: 320px;
    --border-radius: 8px;
    --border-radius-large: 12px;

    /* アニメーション */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--background-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ======================
   ヘッダー
====================== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: #de6171;
    box-shadow: var(--shadow-medium);
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.app-title {
    font-size: 1.4rem;
    font-weight: 500;
    color: white;
    display: flex;
    align-items: center;
    gap: 8px;
}

.title-icon {
    width: 65px;
    height: 65px;
    object-fit: contain;
}

.settings-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    backdrop-filter: blur(10px);
}

.settings-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-1px);
}

/* ======================
   メインコンテンツ
====================== */
.main-content {
    margin-top: 0;
    padding: 30px 0 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: calc(100vh - var(--header-height));
}

/* ======================
   結果表示（amidakuji.cssで定義）
====================== */

.result-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 300;
    opacity: 0.8;
    margin-bottom: 5px;
}

.result-text {
    display: block;
    font-size: 1.3rem;
    font-weight: 500;
    word-break: break-word;
    min-height: 1.5em;
}

/* ======================
   操作パネル
====================== */
.control-panel {
    background: var(--background-secondary);
    border-radius: var(--border-radius-large);
    padding: 20px;
    box-shadow: var(--shadow-medium);
    width: fit-content;
    margin: 20px auto 0;
    margin-bottom: 60px;
}

.control-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.control-buttons button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: inherit;
    box-shadow: var(--shadow-light);
}

.shuffle-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.shuffle-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.reset-btn {
    background: linear-gradient(135deg, #757575, #616161);
    color: white;
}

.reset-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.reveal-btn {
    background: linear-gradient(135deg, var(--success-color), #45a049);
    color: white;
}

.reveal-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.control-buttons button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ======================
   設定パネル (サイドバー)
====================== */
.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--background-secondary);
    box-shadow: var(--shadow-heavy);
    z-index: 1100;
    transform: translateX(100%);
    transition: transform var(--transition-medium);
    overflow-y: auto;
    visibility: hidden;
}

.settings-panel.active {
    transform: translateX(0);
    visibility: visible;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: #de6171;
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

.settings-header h2 {
    font-size: 1.2rem;
    font-weight: 500;
}

.close-settings {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 6px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-settings:hover {
    background: rgba(255,255,255,0.2);
}

.settings-content {
    padding: 20px;
}

.setting-group {
    margin-bottom: 30px;
}

.setting-group h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 15px;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

/* ======================
   フォーム要素
====================== */
.segment-textarea {
    width: 100%;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 12px;
    font-family: inherit;
    font-size: 0.9rem;
    resize: vertical;
    transition: var(--transition-fast);
    background: var(--background-primary);
}

.segment-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(222, 97, 113, 0.15);
}

.segment-info {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
}

/* ======================
   色設定
====================== */
.color-setting {
    margin-bottom: 20px;
}

.color-setting label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.9rem;
}

.color-setting input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    background: none;
}

/* ======================
   ボタン
====================== */
.upload-btn, .clear-btn, .preset-btn, .apply-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: inherit;
    font-size: 0.9rem;
    margin: 5px;
}

.upload-btn:hover, .clear-btn:hover, .preset-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.apply-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-color: var(--primary-color);
    width: 100%;
    font-weight: 500;
    padding: 15px;
}

.apply-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

/* ======================
   オーバーレイ
====================== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ======================
   モーダル
====================== */
.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.7);
    background: var(--background-secondary);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-heavy);
    z-index: 1200;
    max-width: 500px;
    width: 90vw;
    max-height: 80vh;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
}

.modal.active {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    visibility: visible;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: #de6171;
    color: white;
}

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 500;
}

.close-modal {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 6px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal:hover {
    background: rgba(255,255,255,0.2);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    max-height: 60vh;
}

.modal-body ol {
    padding-left: 20px;
}

.modal-body li {
    margin-bottom: 10px;
    line-height: 1.5;
}

/* ======================
   ユーティリティクラス
====================== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn var(--transition-medium);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}