/* =========================================================
   SV5 子主题 · 页面共享层
   ---------------------------------------------------------
   设计基准：全部复用 zuisao.css 已有令牌（--ri-*），不新造色。
   目标：让 template-parts/page 下各页面共用同一套
         hero / 卡片 / 按钮 / 表单 语汇。
   ========================================================= */

:root {
    --sv5-radius: 14px;
    --sv5-radius-sm: 10px;
    --sv5-ease: cubic-bezier(.25, .46, .45, .94);

    --sv5-surface: #ffffff;
    --sv5-surface-2: #f7f8f9;
    --sv5-ink: #191a1f;
    --sv5-ink-2: #595d69;
    --sv5-ink-3: #a1a1a8;
    --sv5-border: rgba(25, 26, 31, .08);
    --sv5-border-strong: rgba(25, 26, 31, .14);

    --sv5-accent: #2163e8;
    --sv5-accent-ink: #1a4fba;
    --sv5-accent-soft: rgba(33, 99, 232, .08);
    --sv5-accent-line: rgba(33, 99, 232, .45);

    --sv5-shadow-1: 0 1px 2px rgba(25, 26, 31, .04);
    --sv5-shadow-2: 0 8px 24px rgba(25, 26, 31, .06);
    --sv5-shadow-3: 0 16px 48px rgba(25, 26, 31, .10);

    --sv5-hero-ink: #ffffff;
    --sv5-hero-sub: rgba(255, 255, 255, .72);

    --sv5-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-bs-theme="dark"] {
    --sv5-surface: #222529;
    --sv5-surface-2: #191a1f;
    --sv5-ink: #f7f8f9;
    --sv5-ink-2: #a1a1a8;
    --sv5-ink-3: #595d69;
    --sv5-border: rgba(255, 255, 255, .08);
    --sv5-border-strong: rgba(255, 255, 255, .16);

    --sv5-accent: #4f9ef8;
    --sv5-accent-ink: #7aa1f1;
    --sv5-accent-soft: rgba(79, 158, 248, .12);

    --sv5-shadow-1: 0 1px 2px rgba(0, 0, 0, .3);
    --sv5-shadow-2: 0 8px 24px rgba(0, 0, 0, .35);
    --sv5-shadow-3: 0 16px 48px rgba(0, 0, 0, .45);
}

/* =========================================================
   基础
   ========================================================= */
.sv5-page {
    font-family: var(--sv5-font);
    color: var(--sv5-ink);
}

.sv5-page a:focus-visible,
.sv5-page button:focus-visible,
.sv5-page input:focus-visible,
.sv5-page select:focus-visible,
.sv5-page textarea:focus-visible,
.sv5-page [tabindex]:focus-visible {
    outline: 2px solid var(--sv5-accent);
    outline-offset: 2px;
    border-radius: 6px;
}

/* =========================================================
   页面头 · 签名组件
   每个子页面顶部同一结构：背景 + 遮罩 + 图标 + 标题 + 副标题 + 徽章
   ========================================================= */
.sv5-hero {
    position: relative;
    overflow: hidden;
    isolation: isolate;
    background:
        radial-gradient(ellipse 700px 320px at 15% 20%, rgba(33, 99, 232, .5), transparent 70%),
        radial-gradient(ellipse 600px 300px at 85% 80%, rgba(79, 158, 248, .35), transparent 70%),
        linear-gradient(135deg, #12141a 0%, #1a1f2b 50%, #12141a 100%);
    color: var(--sv5-hero-ink);
}

.sv5-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
    background-size: 56px 56px;
    pointer-events: none;
}

.sv5-hero-bg {
    position: absolute;
    inset: -20px;
    z-index: -2;
    background-size: cover;
    background-position: center;
    opacity: .35;
    filter: saturate(.9);
}

.sv5-hero-inner {
    position: relative;
    z-index: 1;
    padding: 56px 0 60px;
    text-align: center;
}

.sv5-hero-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    margin-bottom: 18px;
    border-radius: 18px;
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .18);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    font-size: 22px;
    color: #fff;
    box-shadow: 0 8px 30px rgba(33, 99, 232, .3);
}

.sv5-hero-title {
    margin: 0 0 10px;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: .01em;
    line-height: 1.25;
    color: var(--sv5-hero-ink);
    text-shadow: 0 2px 20px rgba(0, 0, 0, .25);
}

.sv5-hero-line {
    width: 56px;
    height: 3px;
    margin: 16px auto;
    border-radius: 3px;
    background: linear-gradient(90deg, transparent, var(--sv5-accent), transparent);
    box-shadow: 0 0 14px rgba(33, 99, 232, .7);
}

.sv5-hero-sub {
    margin: 0 auto;
    max-width: 640px;
    font-size: .98rem;
    line-height: 1.7;
    color: var(--sv5-hero-sub);
}

.sv5-hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 22px;
}

.sv5-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .12);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: .78rem;
    letter-spacing: .04em;
    color: rgba(255, 255, 255, .78);
}

.sv5-hero-badge i {
    color: var(--sv5-accent);
    font-size: .8em;
}

@media (max-width: 767px) {
    .sv5-hero-inner { padding: 40px 0 44px; }
    .sv5-hero-icon { width: 50px; height: 50px; font-size: 18px; border-radius: 14px; }
    .sv5-hero-sub { font-size: .9rem; }
}

/* =========================================================
   区块节奏
   ========================================================= */
.sv5-section {
    padding: 48px 0;
}

.sv5-section--tight {
    padding: 32px 0;
}

.sv5-section-head {
    max-width: 640px;
    margin: 0 auto 32px;
    text-align: center;
}

.sv5-section-head h2,
.sv5-section-head h3 {
    margin: 0 0 8px;
    font-size: clamp(1.25rem, 2.6vw, 1.6rem);
    font-weight: 700;
    color: var(--sv5-ink);
    letter-spacing: .01em;
}

.sv5-section-head p {
    margin: 0;
    font-size: .92rem;
    line-height: 1.7;
    color: var(--sv5-ink-2);
}

/* =========================================================
   卡片 · 统一交互语言（上浮 + 顶部主色描边）
   ========================================================= */
.sv5-card {
    position: relative;
    height: 100%;
    background: var(--sv5-surface);
    border: 1px solid var(--sv5-border);
    border-radius: var(--sv5-radius);
    box-shadow: var(--sv5-shadow-1);
    overflow: hidden;
    transition: transform .35s var(--sv5-ease),
                box-shadow .35s var(--sv5-ease),
                border-color .35s var(--sv5-ease);
}

.sv5-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--sv5-accent), #4f9ef8);
    opacity: 0;
    transition: opacity .3s ease;
    z-index: 2;
}

.sv5-card:hover,
.sv5-card:focus-within {
    transform: translateY(-6px);
    border-color: transparent;
    box-shadow: var(--sv5-shadow-3);
}

.sv5-card:hover::before,
.sv5-card:focus-within::before {
    opacity: 1;
}

.sv5-card-body {
    padding: 22px;
}

.sv5-card-title {
    margin: 0 0 6px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--sv5-ink);
}

.sv5-card-text {
    margin: 0;
    font-size: .875rem;
    line-height: 1.7;
    color: var(--sv5-ink-2);
}

/* 列表型条目（说明、FAQ、步骤） */
.sv5-list {
    display: grid;
    gap: 12px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.sv5-list-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px;
    background: var(--sv5-surface);
    border: 1px solid var(--sv5-border);
    border-radius: var(--sv5-radius-sm);
    font-size: .9rem;
    line-height: 1.7;
    color: var(--sv5-ink-2);
    transition: transform .3s var(--sv5-ease), box-shadow .3s var(--sv5-ease),
                border-color .3s var(--sv5-ease);
}

.sv5-list-item:hover {
    transform: translateY(-3px);
    border-color: var(--sv5-accent-line);
    box-shadow: var(--sv5-shadow-2);
}

.sv5-list-icon {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 9px;
    background: var(--sv5-accent-soft);
    color: var(--sv5-accent);
    font-size: .75rem;
}

/* =========================================================
   按钮
   ========================================================= */
.sv5-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 26px;
    border: 1px solid transparent;
    border-radius: 999px;
    background: var(--sv5-accent);
    color: #fff;
    font-size: .9rem;
    font-weight: 600;
    line-height: 1.4;
    text-decoration: none;
    cursor: pointer;
    transition: transform .25s var(--sv5-ease), box-shadow .25s var(--sv5-ease),
                background-color .25s ease, border-color .25s ease, color .25s ease;
}

.sv5-btn:hover {
    background: var(--sv5-accent-ink);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(33, 99, 232, .3);
}

.sv5-btn:active {
    transform: translateY(0);
    box-shadow: none;
}

.sv5-btn--ghost {
    background: transparent;
    border-color: var(--sv5-border-strong);
    color: var(--sv5-ink);
}

.sv5-btn--ghost:hover {
    background: var(--sv5-accent);
    border-color: var(--sv5-accent);
    color: #fff;
    box-shadow: 0 8px 22px rgba(33, 99, 232, .25);
}

.sv5-btn--block {
    width: 100%;
    border-radius: var(--sv5-radius-sm);
    padding: 12px 20px;
}

.sv5-btn:disabled,
.sv5-btn[disabled] {
    background: var(--sv5-surface-2);
    border-color: var(--sv5-border);
    color: var(--sv5-ink-3);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 分段排序条 */
.sv5-seg {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 6px;
    background: var(--sv5-surface);
    border: 1px solid var(--sv5-border);
    border-radius: 999px;
    box-shadow: var(--sv5-shadow-1);
}

.sv5-seg a,
.sv5-seg button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--sv5-ink-2);
    font-size: .875rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background-color .25s ease, color .25s ease, box-shadow .25s ease;
}

.sv5-seg a:hover,
.sv5-seg button:hover {
    background: var(--sv5-accent-soft);
    color: var(--sv5-accent);
}

.sv5-seg .is-active,
.sv5-seg a.active,
.sv5-seg button.active {
    background: var(--sv5-accent);
    color: #fff;
    box-shadow: 0 4px 14px rgba(33, 99, 232, .3);
}

/* =========================================================
   表单
   ========================================================= */
.sv5-field {
    margin-bottom: 18px;
}

.sv5-field > label,
.sv5-field .form-label {
    display: block;
    margin-bottom: 7px;
    font-size: .86rem;
    font-weight: 600;
    color: var(--sv5-ink);
}

.sv5-field .form-control,
.sv5-field .form-select,
.sv5-field textarea,
.sv5-field input[type="text"],
.sv5-field input[type="email"],
.sv5-field input[type="password"],
.sv5-field input[type="url"],
.sv5-field input[type="search"] {
    width: 100%;
    padding: 11px 14px;
    background: var(--sv5-surface-2);
    border: 1px solid var(--sv5-border-strong);
    border-radius: var(--sv5-radius-sm);
    color: var(--sv5-ink);
    font-size: .925rem;
    line-height: 1.5;
    transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}

[data-bs-theme="dark"] .sv5-field .form-control,
[data-bs-theme="dark"] .sv5-field .form-select,
[data-bs-theme="dark"] .sv5-field input[type="text"],
[data-bs-theme="dark"] .sv5-field input[type="email"],
[data-bs-theme="dark"] .sv5-field input[type="password"],
[data-bs-theme="dark"] .sv5-field input[type="url"] {
    background: rgba(255, 255, 255, .04);
}

.sv5-field .form-control:focus,
.sv5-field .form-select:focus,
.sv5-field input:focus,
.sv5-field textarea:focus {
    background: var(--sv5-surface);
    border-color: var(--sv5-accent);
    box-shadow: 0 0 0 4px var(--sv5-accent-soft);
    outline: none;
}

.sv5-field .form-control::placeholder {
    color: var(--sv5-ink-3);
}

.sv5-field .form-control[disabled] {
    opacity: .7;
    cursor: not-allowed;
}

.sv5-hint {
    margin-top: 7px;
    font-size: .8rem;
    line-height: 1.6;
    color: var(--sv5-ink-3);
}

.sv5-legend {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 26px 0 14px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--sv5-border-strong);
    font-size: .9rem;
    font-weight: 700;
    color: var(--sv5-ink);
}

.sv5-legend i {
    color: var(--sv5-accent);
}

/* =========================================================
   空状态 / 提示
   ========================================================= */
.sv5-empty {
    grid-column: 1 / -1;
    padding: 56px 20px;
    text-align: center;
    background: var(--sv5-surface);
    border: 1px dashed var(--sv5-border-strong);
    border-radius: var(--sv5-radius);
    color: var(--sv5-ink-2);
}

.sv5-empty-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin-bottom: 14px;
    border-radius: 50%;
    background: var(--sv5-accent-soft);
    color: var(--sv5-accent);
    font-size: 20px;
}

.sv5-empty h4 {
    margin: 0 0 6px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--sv5-ink);
}

.sv5-empty p {
    margin: 0;
    font-size: .875rem;
    color: var(--sv5-ink-3);
}

/* 页尾 CTA */
.sv5-cta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-top: 36px;
    padding: 26px;
    text-align: center;
    background: var(--sv5-surface);
    border: 1px solid var(--sv5-border);
    border-radius: var(--sv5-radius);
    box-shadow: var(--sv5-shadow-1);
}

.sv5-cta p {
    margin: 0;
    font-size: .92rem;
    color: var(--sv5-ink-2);
}

.sv5-cta strong {
    color: var(--sv5-ink);
}

/* =========================================================
   动效可访问性
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
    .sv5-page *,
    .sv5-card,
    .sv5-list-item,
    .sv5-btn,
    .sv5-seg a,
    .sv5-seg button {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        scroll-behavior: auto !important;
    }

    .sv5-card:hover,
    .sv5-card:focus-within,
    .sv5-list-item:hover,
    .sv5-btn:hover {
        transform: none;
    }
}