/* 学习进度管理器 - 清新卡片风格样式 */

/* -------------------------------
   设计变量
   ------------------------------- */
:root {
    /* 清新配色 */
    --color-bg: #f5f9f6;
    --color-surface: #ffffff;
    --color-cream: #fffdf7;
    --color-mint: #e8f5e9;
    --color-sky: #e3f2fd;
    --color-blush: #fff0f3;

    /* 主色 */
    --color-primary: #6bcb77;
    --color-primary-dark: #56a35f;
    --color-primary-light: #b9e9bf;

    /* 辅助色 */
    --color-secondary: #8bb6d9;
    --color-accent: #ffd166;
    --color-danger: #ff8a8a;
    --color-danger-dark: #e06c6c;
    --color-warning: #ffd166;

    /* 文字 */
    --color-text: #2c3e50;
    --color-text-secondary: #6b7b8c;
    --color-text-muted: #9aacb8;

    /* 边框与阴影 */
    --color-border: rgba(107, 203, 119, 0.15);
    --shadow-sm: 0 2px 8px rgba(44, 62, 80, 0.04);
    --shadow-md: 0 8px 24px rgba(44, 62, 80, 0.08);
    --shadow-lg: 0 12px 32px rgba(44, 62, 80, 0.12);

    /* 圆角 */
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    /* 间距 */
    --space-xs: 6px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;

    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -------------------------------
   基础重置
   ------------------------------- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg);
    background-image:
        radial-gradient(circle at 10% 10%, rgba(107, 203, 119, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 20%, rgba(139, 182, 217, 0.08) 0%, transparent 40%);
    color: var(--color-text);
    line-height: 1.65;
    padding-bottom: 100px;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

#app {
    max-width: 680px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* -------------------------------
   页面标题
   ------------------------------- */
#app > h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
}

#app > h1 + p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--space-lg);
}

#app > h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

#app > h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 18px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

/* -------------------------------
   底部导航
   ------------------------------- */
.bottom-nav {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 40px);
    max-width: 420px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: space-around;
    padding: 8px;
    z-index: 100;
}

.nav-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    padding: 12px 20px;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
}

.nav-btn:hover {
    color: var(--color-primary-dark);
    background: rgba(107, 203, 119, 0.08);
}

.nav-btn.active {
    color: #fff;
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    box-shadow: 0 4px 12px rgba(107, 203, 119, 0.35);
}

.nav-btn:active {
    transform: scale(0.96);
}

/* -------------------------------
   通用按钮
   ------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.4;
    box-shadow: 0 4px 12px rgba(107, 203, 119, 0.25);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn::before {
    content: '✦';
    font-size: 0.75em;
    opacity: 0.8;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(107, 203, 119, 0.35);
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

.btn-secondary {
    background: #fff;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary::before {
    content: '✎';
}

.btn-secondary:hover {
    background: var(--color-cream);
    color: var(--color-text);
    border-color: rgba(107, 203, 119, 0.25);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger), var(--color-danger-dark));
    box-shadow: 0 4px 12px rgba(255, 138, 138, 0.25);
}

.btn-danger::before {
    content: '✕';
}

.btn-danger:hover {
    box-shadow: 0 6px 18px rgba(255, 138, 138, 0.35);
}

/* 新建目标按钮特殊样式 */
.page-header .btn {
    padding: 10px 18px;
    border-radius: var(--radius-lg);
}

.page-header .btn::before {
    content: '+';
    font-size: 1em;
    font-weight: 400;
}

/* -------------------------------
   卡片
   ------------------------------- */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-light), var(--color-secondary));
    opacity: 0.6;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    word-break: break-word;
    line-height: 1.4;
}

.card > p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.card-actions {
    margin-top: var(--space-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

/* -------------------------------
   空状态
   ------------------------------- */
.empty-state {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-cream) 100%);
    border: 2px dashed rgba(107, 203, 119, 0.25);
}

.empty-state::before {
    content: '🌱';
    display: block;
    font-size: 3.5rem;
    margin-bottom: var(--space-md);
    animation: bounce 2s infinite ease-in-out;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.empty-state p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

/* -------------------------------
   进度条
   ------------------------------- */
.progress-bar {
    width: 100%;
    height: 14px;
    background: rgba(233, 236, 239, 0.6);
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin: var(--space-sm) 0;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(44, 62, 80, 0.06);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border-radius: var(--radius-xl);
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    box-shadow: 0 2px 8px rgba(107, 203, 119, 0.25);
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.35) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    animation: shimmer 2.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* 已完成目标的进度条 */
.card:has(.progress-fill[style*="100%"]) .progress-fill {
    background: linear-gradient(90deg, var(--color-primary) 0%, #4ecdc4 100%);
}

/* -------------------------------
   表单
   ------------------------------- */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid #e8ecef;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-surface);
    transition: all var(--transition-base);
    appearance: none;
}

.form-group input::placeholder,
.form-group select:invalid {
    color: var(--color-text-muted);
}

.form-group input:hover,
.form-group select:hover {
    border-color: var(--color-primary-light);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(107, 203, 119, 0.12);
    background: #fff;
}

/* 下拉箭头 */
.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7b8c' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* 日期选择器图标 */
.form-group input[type="date"] {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7b8c' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect width='18' height='18' x='3' y='4' rx='2' ry='2'/%3E%3Cline x1='16' x2='16' y1='2' y2='6'/%3E%3Cline x1='8' x2='8' y1='2' y2='6'/%3E%3Cline x1='3' x2='21' y1='10' y2='10'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* -------------------------------
   提醒标签
   ------------------------------- */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: var(--radius-xl);
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: var(--space-sm);
    border: 1px solid transparent;
}

.tag::before {
    content: '•';
    font-size: 1.2em;
}

.tag-warning {
    background: rgba(255, 209, 102, 0.15);
    color: #b38600;
    border-color: rgba(255, 209, 102, 0.3);
}

.tag-warning::before {
    content: '⏰';
}

.tag-danger {
    background: rgba(255, 138, 138, 0.12);
    color: #c44b4b;
    border-color: rgba(255, 138, 138, 0.25);
}

.tag-danger::before {
    content: '🔥';
}

/* 今日推荐卡片中的记录按钮 */
.card .btn {
    margin-top: 4px;
}

/* -------------------------------
   响应式布局
   ------------------------------- */
@media (max-width: 480px) {
    body {
        padding-bottom: 100px;
    }

    #app {
        padding: var(--space-md) var(--space-sm);
    }

    #app > h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: var(--space-md);
        border-radius: var(--radius-sm);
    }

    .page-header {
        flex-direction: row;
        gap: var(--space-sm);
    }

    .page-header h1 {
        font-size: 1.3rem;
    }

    .btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }

    .card-actions {
        gap: var(--space-xs);
    }

    .card-actions .btn {
        flex: 1;
        min-width: 0;
    }

    .bottom-nav {
        bottom: 12px;
        width: calc(100% - 24px);
    }

    .nav-btn {
        padding: 10px 12px;
        font-size: 0.9rem;
    }
}

@media (min-width: 768px) {
    #app {
        padding-top: var(--space-xl);
    }

    .card {
        padding: var(--space-xl);
    }

    .bottom-nav {
        max-width: 440px;
    }
}

/* -------------------------------
   无障碍焦点状态
   ------------------------------- */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* -------------------------------
   正向反馈动画
   ------------------------------- */
.celebration-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.92);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    animation: celebrationFadeIn 0.3s ease;
}

.celebration-checkmark {
    width: 84px;
    height: 84px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6bcb77, #4ecdc4);
    color: #fff;
    font-size: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    box-shadow: 0 8px 28px rgba(107, 203, 119, 0.35);
    animation: checkmarkPop 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) both;
}

.celebration-text {
    font-size: 1.25rem;
    color: var(--color-text);
    font-weight: 700;
    text-align: center;
    padding: 0 var(--space-lg);
    line-height: 1.6;
    animation: textSlideUp 0.5s ease 0.2s both;
}

.confetti-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.confetti-piece {
    position: absolute;
    width: 8px;
    height: 12px;
    top: -20px;
    opacity: 0.9;
    animation-name: confettiFall;
    animation-timing-function: linear;
    animation-fill-mode: forwards;
}

.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(44, 62, 80, 0.95);
    color: #fff;
    padding: 12px 22px;
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 1001;
    box-shadow: var(--shadow-md);
    animation: toastSlideIn 0.3s ease, toastSlideOut 0.3s ease 2.2s forwards;
}

@keyframes celebrationFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes checkmarkPop {
    0% { transform: scale(0) rotate(-45deg); opacity: 0; }
    60% { transform: scale(1.2) rotate(0); }
    100% { transform: scale(1) rotate(0); opacity: 1; }
}

@keyframes textSlideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes confettiFall {
    0% { transform: translateY(0) rotate(0); opacity: 1; }
    100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

@keyframes toastSlideIn {
    from { opacity: 0; transform: translate(-50%, -20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes toastSlideOut {
    to { opacity: 0; transform: translate(-50%, -20px); }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}