/* ============================================
   2026高考志愿填报助手 - 自定义样式表
   ============================================ */

/* ---------- CSS变量 ---------- */
:root {
    --primary-blue: #1976D2;
    --primary-green: #2E7D32;
    --success: #388E3C;
    --warning: #FFA000;
    --error: #D32F2F;
    --bg: #F5F5F5;
    --border: #E0E0E0;
    --text-secondary: #757575;
    --text-primary: #212121;
}

/* ---------- 根元素字号 ---------- */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

/* ---------- 全局平滑过渡 ---------- */
*,
*::before,
*::after {
    transition-property: background-color, border-color, color, opacity, box-shadow, transform;
    transition-duration: 0.2s;
    transition-timing-function: ease;
}

/* 需要更长过渡的元素单独覆盖 */
.card-expand,
.accordion-body,
.toast {
    transition-duration: 0.3s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   步骤指示器 (.step-indicator)
   ============================================ */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 12px;
    gap: 0;
    user-select: none;
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    flex: 0 0 auto;
}

.step-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: #FFFFFF;
    background-color: var(--border);
    transition: background-color 0.3s, transform 0.3s, box-shadow 0.3s;
    position: relative;
    z-index: 1;
}

.step-item.active .step-circle,
.step-item.completed .step-circle {
    background-color: var(--primary-blue);
    box-shadow: 0 2px 8px rgba(25, 118, 210, 0.35);
}

.step-item.active .step-circle {
    transform: scale(1.1);
}

.step-item.completed .step-circle {
    background-color: var(--success);
}

.step-label {
    margin-top: 6px;
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: color 0.3s;
}

.step-item.active .step-label {
    color: var(--primary-blue);
    font-weight: 600;
}

.step-item.completed .step-label {
    color: var(--success);
}

/* 步骤之间的连接线 */
.step-line {
    flex: 1;
    height: 3px;
    background-color: var(--border);
    margin: 0 4px;
    margin-bottom: 20px;
    border-radius: 2px;
    transition: background-color 0.3s;
    min-width: 24px;
    max-width: 60px;
}

.step-line.active {
    background-color: var(--primary-blue);
}

.step-line.completed {
    background-color: var(--success);
}

/* ============================================
   Tab 切换样式
   ============================================ */
.tab-bar {
    display: flex;
    border-bottom: 2px solid var(--border);
    background-color: #FFFFFF;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.tab-bar::-webkit-scrollbar {
    display: none;
}

.tab-item {
    flex: 1;
    min-width: 0;
    text-align: center;
    padding: 12px 8px;
    font-size: 14px;
    color: var(--text-secondary);
    position: relative;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition: color 0.2s;
}

.tab-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 2px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-active {
    color: var(--primary-blue);
    font-weight: 600;
}

.tab-active::after {
    width: 60%;
}

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

/* ============================================
   卡片展开动画 (.card-expand)
   ============================================ */
.card-expand {
    background-color: #FFFFFF;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.3s, transform 0.3s;
}

.card-expand:active {
    transform: scale(0.985);
}

.card-expand.expanded {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.card-expand-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.25s ease;
    opacity: 0;
    padding: 0 16px;
}

.card-expand.expanded .card-expand-body {
    max-height: 800px;
    opacity: 1;
    padding: 12px 16px 16px;
}

.card-expand-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
}

.card-expand-arrow {
    width: 20px;
    height: 20px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.card-expand.expanded .card-expand-arrow {
    transform: rotate(180deg);
}

/* ============================================
   Toast 提示样式
   ============================================ */
.toast-container {
    position: fixed;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
    width: calc(100% - 32px);
    max-width: 400px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    line-height: 1.4;
    color: #FFFFFF;
    background-color: #333333;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    pointer-events: auto;
    animation: toast-in 0.3s ease forwards;
    width: 100%;
    box-sizing: border-box;
}

.toast.toast-out {
    animation: toast-out 0.25s ease forwards;
}

.toast.toast-success {
    background-color: var(--success);
}

.toast.toast-warning {
    background-color: var(--warning);
}

.toast.toast-error {
    background-color: var(--error);
}

.toast.toast-info {
    background-color: var(--primary-blue);
}

.toast-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.toast-message {
    flex: 1;
    word-break: break-word;
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(-12px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes toast-out {
    from {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    to {
        opacity: 0;
        transform: translateY(-12px) scale(0.95);
    }
}

/* ============================================
   加载动画 (.loading-spinner)
   ============================================ */
.loading-spinner {
    display: inline-block;
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner.small {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.loading-spinner.large {
    width: 48px;
    height: 48px;
    border-width: 4px;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 8000;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

.loading-text {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   手风琴展开/收起动画
   ============================================ */
.accordion {
    border-radius: 12px;
    overflow: hidden;
    background-color: #FFFFFF;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.accordion-item {
    border-bottom: 1px solid var(--border);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

.accordion-header:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.accordion-header:active {
    background-color: rgba(0, 0, 0, 0.04);
}

.accordion-icon {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.accordion-item.open .accordion-icon {
    transform: rotate(180deg);
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.25s ease;
    opacity: 0;
    padding: 0 16px;
}

.accordion-item.open .accordion-body {
    max-height: 1000px;
    opacity: 1;
    padding: 0 16px 16px;
}

/* ============================================
   表单错误提示 (.field-error)
   ============================================ */
.field-error {
    font-size: 12px;
    color: var(--error);
    margin-top: 4px;
    line-height: 1.4;
    animation: shake 0.3s ease;
}

.field-error::before {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23D32F2F'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    vertical-align: middle;
    margin-right: 4px;
    position: relative;
    top: -1px;
}

.input-error {
    border-color: var(--error) !important;
    box-shadow: 0 0 0 2px rgba(211, 47, 47, 0.15) !important;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px); }
    40% { transform: translateX(4px); }
    60% { transform: translateX(-2px); }
    80% { transform: translateX(2px); }
}

/* ============================================
   按钮点击反馈 (active:opacity)
   ============================================ */
.btn,
button,
a.btn,
[role="button"] {
    -webkit-tap-highlight-color: transparent;
    transition: opacity 0.15s, transform 0.15s;
}

.btn:active,
button:active,
a.btn:active,
[role="button"]:active {
    opacity: 0.7;
    transform: scale(0.97);
}

/* ============================================
   滚动条美化
   ============================================ */
::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.15);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.25);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.15) transparent;
}

/* ============================================
   骨架屏加载动画 (.skeleton)
   ============================================ */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--border) 25%,
        #EEEEEE 37%,
        var(--border) 63%
    );
    background-size: 400% 100%;
    animation: skeleton-loading 1.4s ease infinite;
    border-radius: 4px;
}

.skeleton-text {
    height: 16px;
    margin-bottom: 10px;
    border-radius: 4px;
}

.skeleton-text:last-child {
    width: 60%;
}

.skeleton-title {
    height: 22px;
    margin-bottom: 14px;
    width: 70%;
    border-radius: 4px;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-card {
    height: 120px;
    border-radius: 12px;
    margin-bottom: 12px;
}

.skeleton-image {
    width: 100%;
    height: 160px;
    border-radius: 8px;
    margin-bottom: 12px;
}

@keyframes skeleton-loading {
    0% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0 50%;
    }
}

/* ============================================
   标签选择器样式 (.tag-selected, .tag-unselected)
   ============================================ */
.tag-selected,
.tag-unselected {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.tag-unselected {
    background-color: #FFFFFF;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.tag-unselected:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.tag-unselected:active {
    background-color: rgba(25, 118, 210, 0.05);
}

.tag-selected {
    background-color: var(--primary-blue);
    color: #FFFFFF;
    border: 1px solid var(--primary-blue);
    box-shadow: 0 2px 6px rgba(25, 118, 210, 0.3);
}

.tag-selected:active {
    opacity: 0.85;
}

/* 标签容器 */
.tag-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* ============================================
   响应式媒体查询
   ============================================ */

/* ---- 小屏手机 (320px - 374px) ---- */
@media screen and (max-width: 374px) {
    html {
        font-size: 14px;
    }

    .step-indicator {
        padding: 12px 8px;
    }

    .step-circle {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }

    .step-label {
        font-size: 10px;
    }

    .step-line {
        min-width: 16px;
    }

    .tab-item {
        padding: 10px 6px;
        font-size: 13px;
    }

    .card-expand-header {
        padding: 12px;
    }

    .accordion-header {
        padding: 12px;
        font-size: 14px;
    }

    .tag-selected,
    .tag-unselected {
        padding: 6px 12px;
        font-size: 12px;
    }

    .toast {
        font-size: 13px;
        padding: 10px 12px;
    }

    .toast-container {
        width: calc(100% - 24px);
    }
}

/* ---- 标准手机 (375px - 429px) ---- */
@media screen and (min-width: 375px) and (max-width: 429px) {
    /* 默认样式已针对此尺寸优化，此处仅做微调 */
    .step-indicator {
        padding: 14px 12px;
    }
}

/* ---- 大屏手机 (430px+) ---- */
@media screen and (min-width: 430px) {
    .step-indicator {
        padding: 20px 24px;
    }

    .step-circle {
        width: 36px;
        height: 36px;
        font-size: 15px;
    }

    .step-label {
        font-size: 12px;
    }

    .step-line {
        min-width: 32px;
        max-width: 80px;
    }

    .card-expand-header {
        padding: 16px 20px;
    }

    .accordion-header {
        padding: 16px 20px;
        font-size: 16px;
    }

    .accordion-item.open .accordion-body {
        padding: 0 20px 20px;
    }

    .tag-selected,
    .tag-unselected {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* ---- 平板 (768px+) ---- */
@media screen and (min-width: 768px) {
    .toast-container {
        max-width: 480px;
    }

    .step-indicator {
        gap: 0;
        padding: 24px 40px;
    }

    .step-circle {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .step-label {
        font-size: 13px;
    }

    .step-line {
        min-width: 40px;
        max-width: 120px;
    }

    .card-expand {
        border-radius: 16px;
    }

    .accordion {
        border-radius: 16px;
    }

    .tag-group {
        gap: 10px;
    }
}

/* ---- PC (1024px+) ---- */
@media screen and (min-width: 1024px) {
    .toast-container {
        max-width: 560px;
    }

    .step-indicator {
        padding: 28px 60px;
    }

    .step-circle {
        width: 44px;
        height: 44px;
        font-size: 17px;
    }

    .step-line {
        min-width: 48px;
        max-width: 160px;
    }

    .card-expand {
        border-radius: 16px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    }

    .card-expand:hover {
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    }

    .accordion {
        border-radius: 16px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    }

    /* PC端按钮hover效果增强 */
    .btn:hover,
    button:hover,
    a.btn:hover,
    [role="button"]:hover {
        opacity: 0.9;
    }

    .btn:active,
    button:active,
    a.btn:active,
    [role="button"]:active {
        opacity: 0.7;
        transform: scale(0.97);
    }
}

/* ============================================
   工具类
   ============================================ */
.text-primary { color: var(--primary-blue); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error   { color: var(--error); }
.text-muted   { color: var(--text-secondary); }

.bg-primary { background-color: var(--primary-blue); }
.bg-success { background-color: var(--success); }
.bg-warning { background-color: var(--warning); }
.bg-error   { background-color: var(--error); }

.border-primary { border-color: var(--primary-blue); }
.border-success { border-color: var(--success); }
.border-error   { border-color: var(--error); }

/* 安全区域适配 (iPhone X+) */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .bottom-nav {
        padding-bottom: env(safe-area-inset-bottom);
        height: calc(56px + env(safe-area-inset-bottom));
    }

    .main-content {
        padding-bottom: calc(72px + env(safe-area-inset-bottom));
    }

    .main-content.no-bottom-nav {
        padding-bottom: calc(20px + env(safe-area-inset-bottom));
    }
}

/* 暗色模式预留（可选扩展） */
@media (prefers-color-scheme: dark) {
    /* 暂不启用，预留接口 */
}