/* ============================================================
   极简主义 · Minimalism
   白底、黑字、单一强调色、无阴影、大留白
   ============================================================ */
:root {
    --bg:           #FFFFFF;
    --bg-sub:       #FAFAFA;
    --bg-hover:     #F5F5F5;
    --text:         #111111;
    --text-sub:     #888888;
    --text-light:   #BBBBBB;
    --border:       #E5E5E5;
    --border-strong:#111111;
    --accent:       #111111;   /* 单一强调色：纯黑 */
    --accent-text:  #FFFFFF;
    --radius:       0px;
    --gap:          16px;

    --safe-top:     env(safe-area-inset-top, 0px);
    --safe-bottom:  env(safe-area-inset-bottom, 0px);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

html, body {
    overscroll-behavior: none;
    -webkit-text-size-adjust: 100%;
}

body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: calc(32px + var(--safe-top)) 24px calc(32px + var(--safe-bottom));
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* iframe 内 */
body.embedded {
    background: transparent;
    padding: 0;
    height: 100vh;
    height: 100dvh;
    min-height: 100vh;
    min-height: 100dvh;
    overflow: hidden;
}

/* ============================================================
   主容器
   ============================================================ */
.container {
    width: 100%;
    max-width: 880px;
    display: flex;
    flex-direction: column;
    gap: 48px;
}

/* ============================================================
   顶部标题
   ============================================================ */
.site-header {
    padding: 0;
    flex-shrink: 0;
}
.site-title {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text);
}
.site-title .sub {
    display: none;
}

/* ============================================================
   工具导航（桌面）
   极简：无背景、无边框，仅文字 + 下划线
   ============================================================ */
.tool-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    padding: 0;
    border: none;
    background: transparent;
    flex-shrink: 0;
}

.nav-btn {
    background: transparent;
    color: var(--text-sub);
    border: none;
    padding: 0 0 6px 0;
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    transition: color 0.15s;
    font-family: inherit;
    letter-spacing: 0.05em;
    position: relative;
    min-height: auto;
}
.nav-btn:hover {
    color: var(--text);
}
.nav-btn.active {
    color: var(--text);
    font-weight: 500;
}
.nav-btn.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: var(--text);
}
.nav-btn:focus-visible {
    outline: 1px solid var(--text);
    outline-offset: 4px;
}

/* ============================================================
   内容容器
   极简：无边框、无阴影，只有一条顶线
   ============================================================ */
.content {
    background: var(--bg);
    border: none;
    border-top: 1px solid var(--border);
    padding-top: 32px;
    position: relative;
    overflow: hidden;
    height: 640px;
    height: clamp(420px, calc(100dvh - 280px), 720px);
    min-height: 420px;
}
.content iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* ============================================================
   iframe 内部通用布局
   ============================================================ */
.game-inner {
    width: 100%;
    min-height: 100%;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 0;
    overflow-y: auto;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ============================================================
   通用按钮
   极简：无圆角、无阴影、细边框或纯色
   ============================================================ */
.btn {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--text);
    padding: 12px 24px;
    border-radius: 0;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.15s;
    min-height: 44px;
    text-transform: uppercase;
}
.btn:hover:not(:disabled) {
    background: var(--text);
    color: var(--bg);
}
.btn:active:not(:disabled) { transform: none; }
.btn:disabled { opacity: 0.3; cursor: not-allowed; }
.btn.primary {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
}
.btn.primary:hover:not(:disabled) {
    background: transparent;
    color: var(--text);
}

/* ============================================================
   模态框
   ============================================================ */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.96);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 100;
    padding: 24px;
}
.modal.show { display: flex; }
.modal-box {
    background: transparent;
    border: none;
    padding: 40px;
    max-width: 90vw;
    width: 400px;
    text-align: center;
}
.modal-box h2 {
    font-size: 18px;
    font-weight: 500;
    letter-spacing: 0.15em;
    margin-bottom: 20px;
    color: var(--text);
    text-transform: uppercase;
}
.modal-box p {
    font-size: 14px;
    color: var(--text-sub);
    letter-spacing: 0.05em;
    margin-bottom: 28px;
}
.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}
.modal-actions .btn { flex: 1; }

/* ============================================================
   移动端单行栏
   ============================================================ */
.mobile-topbar {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 0 16px 0;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.mobile-topbar .current-name {
    flex: 1;
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.mobile-topbar .switch-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--text);
    border-radius: 0;
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 500;
    font-family: inherit;
    letter-spacing: 0.15em;
    cursor: pointer;
    min-height: 36px;
    flex-shrink: 0;
    text-transform: uppercase;
    transition: all 0.15s;
}
.mobile-topbar .switch-btn:hover {
    background: var(--text);
    color: var(--bg);
}

/* ============================================================
   全屏选择弹窗
   ============================================================ */
.picker {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 300;
    display: none;
    flex-direction: column;
    padding: calc(32px + env(safe-area-inset-top)) 24px calc(24px + env(safe-area-inset-bottom));
}
.picker.show { display: flex; }
.picker-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 40px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.picker-title {
    color: var(--text);
    font-size: 13px;
    letter-spacing: 0.3em;
    font-weight: 500;
    text-transform: uppercase;
}
.picker-close {
    background: transparent;
    color: var(--text-sub);
    border: none;
    padding: 0;
    font-size: 13px;
    font-family: inherit;
    letter-spacing: 0.15em;
    cursor: pointer;
    text-transform: uppercase;
}
.picker-close:hover { color: var(--text); }
.picker-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    overflow-y: auto;
    align-content: start;
    flex: 1;
}
.picker-item {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    color: var(--text);
    font-size: 20px;
    font-family: inherit;
    font-weight: 400;
    letter-spacing: 0.1em;
    padding: 24px 0;
    cursor: pointer;
    text-align: left;
    transition: padding-left 0.2s, color 0.15s;
    display: flex;
    align-items: center;
}
.picker-item::before {
    content: '';
    display: inline-block;
    width: 0;
    height: 1px;
    background: var(--text);
    margin-right: 0;
    transition: width 0.2s, margin-right 0.2s;
}
.picker-item:hover {
    color: var(--text);
}
.picker-item:hover::before {
    width: 24px;
    margin-right: 12px;
}
.picker-item.active {
    color: var(--text);
    font-weight: 500;
}
.picker-item.active::before {
    width: 24px;
    margin-right: 12px;
    background: var(--text);
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 768px) {
    .mobile-topbar { display: none !important; }
    .picker { display: none !important; }
}

@media (max-width: 767px) {
    body {
        padding: calc(20px + var(--safe-top)) 20px calc(20px + var(--safe-bottom));
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
    }
    .container {
        flex: 1;
        min-height: 0;
        gap: 24px;
    }
    .site-header { padding: 0; }
    .site-title { font-size: 12px; letter-spacing: 0.25em; }
    .site-title .sub { display: none; }
    .tool-nav { display: none; }
    .mobile-topbar { display: flex; }
    .content {
        flex: 1;
        min-height: 0;
        height: auto;
        padding-top: 20px;
    }
    .game-inner { padding: 0; }
}