/* 
 * 初中英语学习网 - 新主题样式
 * 主色 #2b78e4 | 辅助色 #ff9500 | 背景 #f7f9fc
 * 移动端优先，清爽简洁、少年感
 */

/* 覆盖 Bootstrap 主色为方案主色 */
:root {
    --bs-primary: #2b78e4;
    --bs-primary-rgb: 43, 120, 228;
    --bs-link-color: #2b78e4;
    --bs-link-color-rgb: 43, 120, 228;
    --bs-link-hover-color: #1f5fc0;
    --bs-link-hover-color-rgb: 31, 95, 192;
    --bs-warning: #ff9500;
    --bs-warning-rgb: 255, 149, 0;
    --site-bg: #f7f9fc;
    --site-text: #333333;
    --site-text-sub: #666666;
}

body {
    background-color: var(--site-bg);
    color: var(--site-text);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

.text-primary { color: var(--bs-primary) !important; }
.bg-primary { background-color: var(--bs-primary) !important; }
.btn-primary {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background-color: #1f5fc0;
    border-color: #1f5fc0;
}
.btn-outline-primary {
    color: var(--bs-primary);
    border-color: var(--bs-primary);
}
.btn-outline-primary:hover, .btn-outline-primary:active {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
}
.bg-primary.bg-opacity-10 { background-color: rgba(43, 120, 228, 0.1) !important; }
.border-primary { border-color: var(--bs-primary) !important; }
.text-warning { color: var(--bs-warning) !important; }
.bg-warning { background-color: var(--bs-warning) !important; }
.btn-warning {
    background-color: var(--bs-warning);
    border-color: var(--bs-warning);
    color: #fff;
}
.btn-warning:hover {
    background-color: #e08500;
    border-color: #e08500;
    color: #fff;
}
a { color: var(--bs-primary); }
a:hover { color: #1f5fc0; }

/* ---------- 顶部导航 ---------- */
.site-navbar {
    background: linear-gradient(135deg, #2b78e4 0%, #4a90e8 100%);
    box-shadow: 0 2px 12px rgba(43, 120, 228, 0.25);
}
.site-navbar .navbar-brand {
    font-weight: 800;
    letter-spacing: 0.5px;
}
.site-navbar .navbar-brand small {
    font-size: 11px;
    font-weight: 400;
    opacity: 0.85;
    letter-spacing: 0;
}
.site-navbar .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
}
.site-navbar .nav-link:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
}
.site-navbar .nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
    font-weight: 600;
}
.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.4);
}
.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ---------- 首页 Banner ---------- */
.hero-banner {
    background: linear-gradient(135deg, #2b78e4 0%, #6aa8f0 60%, #8fc1ff 100%);
    color: #fff;
    border-radius: 20px;
    padding: 36px 24px;
    position: relative;
    overflow: hidden;
}
.hero-banner::after {
    content: "";
    position: absolute;
    right: -40px;
    top: -40px;
    width: 180px;
    height: 180px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 50%;
}
.hero-banner::before {
    content: "";
    position: absolute;
    right: 60px;
    bottom: -70px;
    width: 140px;
    height: 140px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
}
.hero-banner h1 {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 8px;
}
.hero-banner .hero-sub {
    font-size: 14px;
    opacity: 0.92;
    margin-bottom: 20px;
}
.hero-banner .btn {
    border-radius: 999px;
    padding: 9px 22px;
    font-weight: 600;
}
.hero-banner .btn-warning {
    color: #fff;
    box-shadow: 0 4px 14px rgba(255, 149, 0, 0.4);
}
.hero-banner .btn-light {
    color: var(--bs-primary);
}

/* ---------- 模块标题 ---------- */
.section-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--site-text);
    display: flex;
    align-items: center;
    gap: 8px;
}
.section-title::before {
    content: "";
    width: 4px;
    height: 18px;
    border-radius: 3px;
    background: var(--bs-primary);
}

/* ---------- 学习功能卡片 ---------- */
.study-card {
    background: #fff;
    border: 1px solid #eef1f6;
    border-radius: 16px;
    padding: 18px 16px;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}
.study-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(43, 120, 228, 0.1);
}
.study-card .study-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 10px;
}
.study-card .study-title {
    font-weight: 700;
    font-size: 15px;
    color: var(--site-text);
}
.study-card .study-desc {
    font-size: 12px;
    color: var(--site-text-sub);
    margin-top: 2px;
}

/* 年级单词库标签 */
.grade-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 14px;
    color: #fff;
    border: none;
    transition: transform 0.15s;
}
.grade-chip:hover { transform: translateY(-2px); color: #fff; }
.grade-7 { background: linear-gradient(135deg, #2b78e4, #5b9df0); }
.grade-8 { background: linear-gradient(135deg, #00b578, #33c68f); }
.grade-9 { background: linear-gradient(135deg, #ff9500, #ffb340); }

/* ---------- 任务中心 ---------- */
.task-card {
    background: #fff;
    border: 1px solid #eef1f6;
    border-radius: 16px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: box-shadow 0.2s;
}
.task-card .task-reward {
    background: rgba(255, 149, 0, 0.12);
    color: #e08500;
    font-weight: 700;
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 8px;
    white-space: nowrap;
}
.task-tip {
    background: #fff8ec;
    border: 1px solid #ffe3b3;
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 13px;
    color: #8a6a00;
    line-height: 1.6;
}

/* ---------- 单词卡片 ---------- */
.word-card {
    background: #fff;
    border: 1px solid #eef1f6;
    border-radius: 20px;
    padding: 36px 20px;
    min-height: 240px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}
.word-card .word-en {
    font-size: 34px;
    font-weight: 800;
    color: var(--bs-primary);
    word-break: break-word;
    line-height: 1.3;
}
.word-card .word-phonetic {
    color: #999;
    font-size: 15px;
    margin-top: 6px;
}
.word-card .word-cn {
    font-size: 20px;
    font-weight: 600;
    color: var(--site-text);
    margin-top: 18px;
    line-height: 1.5;
}
.word-card .word-reveal-btn {
    margin-top: 20px;
    border-radius: 999px;
    padding: 8px 24px;
}
.word-card .word-index {
    position: absolute;
    top: 14px;
    left: 16px;
    font-size: 13px;
    color: #aaa;
}

/* 听写输入 */
.dictate-input {
    border: 2px solid #e3e8f0;
    border-radius: 12px;
    font-size: 18px;
    padding: 12px 16px;
    text-align: center;
    width: 100%;
    max-width: 320px;
    outline: none;
    transition: border-color 0.2s;
}
.dictate-input:focus { border-color: var(--bs-primary); }

/* ---------- 移动端底部导航 ---------- */
#bottomNav {
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.06);
    background: #fff !important;
}
#bottomNav .nav-link {
    color: #9aa3b0;
    padding: 5px 6px;
}
#bottomNav .nav-link.active {
    color: var(--bs-primary);
}
#bottomNav .nav-link i {
    font-size: 20px;
}
#bottomNav .nav-link small {
    font-size: 11px;
}

/* ---------- 通用 ---------- */
.text-sub { color: var(--site-text-sub); }
.card { border-radius: 14px; }
.balance-card {
    background: linear-gradient(135deg, #2b78e4 0%, #5b9df0 100%);
    border-radius: 16px;
    color: #fff;
    padding: 20px;
}
.balance-card .balance-num {
    font-size: 30px;
    font-weight: 800;
}
.wallet-stat {
    background: #fff;
    border: 1px solid #eef1f6;
    border-radius: 12px;
    padding: 12px 8px;
    text-align: center;
}
.wallet-stat .num { font-weight: 700; font-size: 16px; }
.wallet-stat .label { font-size: 12px; color: var(--site-text-sub); }

/* 合规文档页 */
.doc-page h2 {
    font-size: 20px;
    font-weight: 700;
    margin: 22px 0 10px;
    color: var(--site-text);
}
.doc-page h3 {
    font-size: 16px;
    font-weight: 700;
    margin: 16px 0 8px;
}
.doc-page p, .doc-page li {
    font-size: 14px;
    line-height: 1.9;
    color: #444;
}
.doc-page ul { padding-left: 20px; }

/* 资料库单词表 */
.word-table th {
    background: #f1f5fb;
    font-size: 13px;
    color: #555;
    font-weight: 600;
}
.word-table td {
    font-size: 14px;
    vertical-align: middle;
}
.word-table .en {
    font-weight: 600;
    color: var(--bs-primary);
}

/* 趣味英语板块 */
.fun-block {
    background: linear-gradient(135deg, #fff7ed 0%, #fff 100%);
    border: 1px dashed #ffc57a;
    border-radius: 14px;
    padding: 14px;
}
.fun-block .fun-quote {
    font-size: 14px;
    color: #b96a00;
    line-height: 1.8;
}