/* ============================================================
   智瞰AI高中信息技术教学平台 Design System · globals.css
   Unified visual language for Student / Teacher / Studio
   ============================================================ */

/* ─────────────────────────────────────────────
   § 1  COLOR TOKENS
   ───────────────────────────────────────────── */

:root {
    /* ── Brand: XMU Blue lineage ── */
    --cs-navy:            #002A5E;
    --cs-brand:           #003C88;
    --cs-primary-700:     #003C88;
    --cs-primary-600:     #0050B5;
    --cs-primary-500:     #0062D6;
    --cs-primary-400:     #3B82F6;
    --cs-primary-300:     #60A5FA;
    --cs-primary-200:     #93C5FD;
    --cs-primary-100:     #DBEAFE;
    --cs-primary-50:      #EFF6FF;

    /* ── Accent: Purple-violet (AI, Studio) ── */
    --cs-accent-700:      #5B21B6;
    --cs-accent-600:      #7C3AED;
    --cs-accent-500:      #8B5CF6;
    --cs-accent-400:      #A78BFA;
    --cs-accent-100:      #EDE9FE;
    --cs-accent-50:       #F5F3FF;

    /* ── Semantic: Success ── */
    --cs-success-600:     #059669;
    --cs-success-500:     #10B981;
    --cs-success-400:     #34D399;
    --cs-success-100:     #D1FAE5;
    --cs-success-50:      #ECFDF5;
    --cs-success-soft:    rgba(16, 185, 129, 0.10);
    --cs-success-glow:    rgba(16, 185, 129, 0.50);

    /* ── Semantic: Warning ── */
    --cs-warn-600:        #D97706;
    --cs-warn-500:        #F59E0B;
    --cs-warn-400:        #FBBF24;
    --cs-warn-100:        #FEF3C7;
    --cs-warn-50:         #FFFBEB;
    --cs-warn-soft:       rgba(245, 158, 11, 0.10);

    /* ── Semantic: Danger / Control ── */
    --cs-danger-600:      #DC2626;
    --cs-danger-500:      #EF4444;
    --cs-danger-400:      #F87171;
    --cs-danger-100:      #FEE2E2;
    --cs-danger-50:       #FEF2F2;
    --cs-danger-soft:     rgba(239, 68, 68, 0.10);
    --cs-danger-glow:     rgba(225, 29, 72, 0.10);

    /* ── Neutral / Surface ── */
    --cs-bg-page:         #F4F7FB;
    --cs-bg-wash:         #EDF2F8;
    --cs-bg-elevated:     #FFFFFF;
    --cs-surface-primary: rgba(255, 255, 255, 0.72);
    --cs-surface-subtle:  rgba(255, 255, 255, 0.46);
    --cs-surface-input:   rgba(255, 255, 255, 0.58);

    /* ── Text ── */
    --cs-text-primary:    #1D1D1F;
    --cs-text-secondary:  #374151;
    --cs-text-tertiary:   #6B7280;
    --cs-text-muted:      #9CA3AF;
    --cs-text-ghost:      #D1D5DB;

    /* ── Border ── */
    --cs-border-default:  rgba(15, 23, 42, 0.08);
    --cs-border-subtle:   rgba(255, 255, 255, 0.64);
    --cs-border-strong:   rgba(255, 255, 255, 0.88);

    /* Input / textarea / select — focus ring + outer glow (测验、填空可见确认) */
    --cs-input-focus-border: var(--cs-primary-500);
    --cs-input-focus-shadow:
        0 0 0 3px color-mix(in srgb, var(--cs-primary-500) 24%, transparent),
        0 0 0 6px color-mix(in srgb, var(--cs-primary-400) 11%, transparent),
        0 4px 28px color-mix(in srgb, var(--cs-primary-500) 34%, transparent);

    /* ─────────────────────────────────────────────
       § 2  SHADOW TOKENS
       ───────────────────────────────────────────── */

    --cs-shadow-xs:       0 1px 2px rgba(15, 23, 42, 0.02);
    --cs-shadow-sm:       0 6px 14px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
    --cs-shadow-md:       0 10px 24px rgba(15, 23, 42, 0.05), 0 2px 5px rgba(15, 23, 42, 0.025);
    --cs-shadow-lg:       0 16px 34px rgba(15, 23, 42, 0.06), 0 3px 8px rgba(15, 23, 42, 0.03);
    --cs-shadow-xl:       0 24px 52px rgba(15, 23, 42, 0.07), 0 5px 12px rgba(15, 23, 42, 0.035);

    /* Brand-tinted shadow for branded elements */
    --cs-shadow-brand:    0 14px 30px rgba(59, 130, 246, 0.12);

    /* ─────────────────────────────────────────────
       § 3  SPACING & RADIUS TOKENS
       ───────────────────────────────────────────── */

    --cs-radius-xs:       6px;
    --cs-radius-sm:       8px;
    --cs-radius-md:       12px;
    --cs-radius-lg:       16px;
    --cs-radius-xl:       20px;
    --cs-radius-2xl:      24px;
    --cs-radius-full:     9999px;

    --cs-space-1:         4px;
    --cs-space-2:         8px;
    --cs-space-3:         12px;
    --cs-space-4:         16px;
    --cs-space-5:         20px;
    --cs-space-6:         24px;
    --cs-space-8:         32px;
    --cs-space-10:        40px;
    --cs-space-12:        48px;

    /* ─────────────────────────────────────────────
       § 4  GLASSMORPHISM TOKENS
       ───────────────────────────────────────────── */

    --cs-glass-bg:            rgba(255, 255, 255, 0.50);
    --cs-glass-bg-panel:      rgba(255, 255, 255, 0.44);
    --cs-glass-bg-card:       rgba(255, 255, 255, 0.40);
    --cs-glass-bg-header:     rgba(255, 255, 255, 0.52);
    --cs-glass-bg-modal:      rgba(255, 255, 255, 0.58);
    --cs-glass-bg-popover:    rgba(255, 255, 255, 0.60);
    --cs-glass-blur:          20px;
    --cs-glass-blur-strong:   26px;
    --cs-glass-saturate:      1.5;
    --cs-glass-border:        1px solid rgba(255, 255, 255, 0.74);
    --cs-glass-border-subtle: 1px solid rgba(255, 255, 255, 0.62);
    --cs-mesh-blue:           rgba(153, 208, 255, 0.32);
    --cs-mesh-violet:         rgba(204, 188, 255, 0.24);
    --cs-mesh-mint:           rgba(176, 238, 220, 0.20);
    --cs-mesh-pearl:          rgba(255, 255, 255, 0.74);

    /* ─────────────────────────────────────────────
       § 5  TRANSITION TOKENS
       ───────────────────────────────────────────── */

    --cs-ease-spring:     cubic-bezier(0.22, 1, 0.36, 1);
    --cs-ease-out:        cubic-bezier(0.16, 1, 0.3, 1);
    --cs-duration-fast:   150ms;
    --cs-duration-normal: 250ms;
    --cs-duration-slow:   400ms;

    /* ─────────────────────────────────────────────
       § 6  TYPOGRAPHY SCALE
       ───────────────────────────────────────────── */

    --cs-text-hero:       2rem;        /* 32px — landing hero */
    --cs-text-h1:         1.5rem;      /* 24px */
    --cs-text-h2:         1.25rem;     /* 20px */
    --cs-text-h3:         1.0625rem;   /* 17px */
    --cs-text-body:       0.9375rem;   /* 15px */
    --cs-text-sm:         0.8125rem;   /* 13px */
    --cs-text-xs:         0.6875rem;   /* 11px */
    --cs-text-micro:      0.5625rem;   /* 9px */

    --cs-leading-tight:   1.25;
    --cs-leading-normal:  1.5;
    --cs-leading-relaxed: 1.65;

    --cs-tracking-tight:  -0.025em;
    --cs-tracking-normal: 0;
    --cs-tracking-wide:   0.02em;
    --cs-tracking-caps:   0.12em;
}


/* ─────────────────────────────────────────────
   § 7  GLOBAL RESET & BASE TYPOGRAPHY
   ───────────────────────────────────────────── */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    margin: 0;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    margin: 0;
    font-family:
        -apple-system, BlinkMacSystemFont,
        "PingFang SC", "Microsoft YaHei", "Noto Sans SC",
        "Helvetica Neue", Arial, sans-serif;
    font-size: var(--cs-text-body);
    line-height: var(--cs-leading-normal);
    color: var(--cs-text-primary);
    background-color: var(--cs-bg-page);
}

/* ── Typography classes ── */

.cs-text-hero {
    font-size: var(--cs-text-hero);
    font-weight: 800;
    line-height: var(--cs-leading-tight);
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
}

.cs-text-h1 {
    font-size: var(--cs-text-h1);
    font-weight: 700;
    line-height: var(--cs-leading-tight);
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
}

.cs-text-h2 {
    font-size: var(--cs-text-h2);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
}

.cs-text-h3 {
    font-size: var(--cs-text-h3);
    font-weight: 600;
    line-height: 1.35;
    color: var(--cs-text-secondary);
}

.cs-text-body {
    font-size: var(--cs-text-body);
    font-weight: 400;
    line-height: var(--cs-leading-normal);
    color: var(--cs-text-secondary);
}

.cs-text-sm {
    font-size: var(--cs-text-sm);
    font-weight: 500;
    line-height: var(--cs-leading-normal);
    color: var(--cs-text-tertiary);
}

.cs-text-xs {
    font-size: var(--cs-text-xs);
    font-weight: 600;
    line-height: 1.4;
    color: var(--cs-text-muted);
}

.cs-text-micro {
    font-size: var(--cs-text-micro);
    font-weight: 600;
    line-height: 1.3;
    color: var(--cs-text-muted);
}

.cs-text-caps {
    font-size: var(--cs-text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--cs-tracking-caps);
    color: var(--cs-text-muted);
}

.cs-text-brand {
    color: var(--cs-brand);
}


/* ─────────────────────────────────────────────
   § 8  GLASSMORPHISM MATERIAL SYSTEM
   ───────────────────────────────────────────── */

/* Base: standard glass surface (sidebars, general containers) */
.cs-glass-base {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.34));
    backdrop-filter: blur(var(--cs-glass-blur)) saturate(var(--cs-glass-saturate));
    -webkit-backdrop-filter: blur(var(--cs-glass-blur)) saturate(var(--cs-glass-saturate));
    border: var(--cs-glass-border);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.78),
        0 8px 22px rgba(15, 23, 42, 0.045);
}

/* Panel: denser glass (studio sidebar, right inspector, chat panels) */
.cs-glass-panel {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.50), rgba(255, 255, 255, 0.28));
    backdrop-filter: blur(var(--cs-glass-blur-strong)) saturate(1.35);
    -webkit-backdrop-filter: blur(var(--cs-glass-blur-strong)) saturate(1.35);
    border: var(--cs-glass-border-subtle);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.82),
        0 10px 26px rgba(15, 23, 42, 0.05);
}

/* Card: lighter glass for list items, student cards, chat bubbles */
.cs-glass-card {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.54), rgba(255, 255, 255, 0.28));
    backdrop-filter: blur(20px) saturate(1.18);
    -webkit-backdrop-filter: blur(20px) saturate(1.18);
    border: var(--cs-glass-border-subtle);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.82),
        0 6px 18px rgba(15, 23, 42, 0.04);
}

/* Header: top navigation bar with hairline bottom separator */
.cs-glass-header {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.60), rgba(255, 255, 255, 0.34));
    backdrop-filter: blur(var(--cs-glass-blur)) saturate(var(--cs-glass-saturate));
    -webkit-backdrop-filter: blur(var(--cs-glass-blur)) saturate(var(--cs-glass-saturate));
    border: var(--cs-glass-border);
    border-bottom: 1px solid rgba(255, 255, 255, 0.54);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.86),
        0 8px 20px rgba(15, 23, 42, 0.045);
}

/* Modal overlay glass */
.cs-glass-modal {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.66), rgba(255, 255, 255, 0.42));
    backdrop-filter: blur(var(--cs-glass-blur-strong)) saturate(1.32);
    -webkit-backdrop-filter: blur(var(--cs-glass-blur-strong)) saturate(1.32);
    border: 1px solid rgba(255, 255, 255, 0.72);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.88),
        0 18px 40px rgba(15, 23, 42, 0.06);
}

/* Popover / dropdown menus */
.cs-glass-popover {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.68), rgba(255, 255, 255, 0.42));
    backdrop-filter: blur(var(--cs-glass-blur-strong)) saturate(1.5);
    -webkit-backdrop-filter: blur(var(--cs-glass-blur-strong)) saturate(1.5);
    border: var(--cs-glass-border-subtle);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.88),
        0 12px 28px rgba(15, 23, 42, 0.06);
}


/* ─────────────────────────────────────────────
   § 9  BUTTON SYSTEM
   ───────────────────────────────────────────── */

/* Shared button skeleton */
[class*="cs-btn"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border-radius: var(--cs-radius-md);
    font-size: var(--cs-text-sm);
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    border: 1px solid transparent;
    transition:
        background var(--cs-duration-normal) var(--cs-ease-spring),
        color var(--cs-duration-normal) var(--cs-ease-spring),
        border-color var(--cs-duration-normal) var(--cs-ease-spring),
        box-shadow var(--cs-duration-normal) var(--cs-ease-spring),
        transform var(--cs-duration-fast) var(--cs-ease-spring);
    -webkit-tap-highlight-color: rgba(0, 60, 136, 0.08);
    touch-action: manipulation;
    user-select: none;
}
[class*="cs-btn"]:active {
    transform: scale(0.97);
}
[class*="cs-btn"]:focus-visible {
    outline: 2px solid var(--cs-primary-400);
    outline-offset: 2px;
}
[class*="cs-btn"]:disabled {
    opacity: 0.45;
    pointer-events: none;
}

/* Primary: solid brand blue */
.cs-btn-primary {
    background: var(--cs-primary-600);
    color: #fff;
    border-color: var(--cs-primary-600);
    box-shadow: var(--cs-shadow-xs), 0 1px 0 rgba(255, 255, 255, 0.25) inset;
}
.cs-btn-primary:hover {
    background: var(--cs-primary-700);
    border-color: var(--cs-primary-700);
    box-shadow: var(--cs-shadow-sm), 0 1px 0 rgba(255, 255, 255, 0.20) inset;
}

/* Secondary: ghost on glass with brand tint */
.cs-btn-secondary {
    background: rgba(0, 0, 0, 0.02);
    color: var(--cs-text-tertiary);
    border-color: var(--cs-border-default);
}
.cs-btn-secondary:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--cs-text-secondary);
}

/* Soft primary: translucent brand fill */
.cs-btn-soft-primary {
    background: rgba(0, 98, 214, 0.08);
    color: var(--cs-primary-600);
    border-color: rgba(0, 98, 214, 0.18);
}
.cs-btn-soft-primary:hover {
    background: rgba(0, 98, 214, 0.14);
    border-color: rgba(0, 98, 214, 0.28);
}

/* Soft accent: for AI / creative actions */
.cs-btn-soft-accent {
    background: linear-gradient(90deg, rgba(139, 92, 246, 0.10), rgba(59, 130, 246, 0.10));
    color: var(--cs-accent-600);
    border-color: rgba(139, 92, 246, 0.18);
}
.cs-btn-soft-accent:hover {
    background: linear-gradient(90deg, rgba(139, 92, 246, 0.16), rgba(59, 130, 246, 0.16));
    border-color: rgba(139, 92, 246, 0.28);
}

/* Soft danger: for destructive / control actions */
.cs-btn-soft-danger {
    background: var(--cs-danger-soft);
    color: var(--cs-danger-600);
    border-color: rgba(239, 68, 68, 0.18);
}
.cs-btn-soft-danger:hover {
    background: rgba(239, 68, 68, 0.14);
    border-color: rgba(239, 68, 68, 0.28);
}

/* Apple system blue: for auth / high-impact CTA */
.cs-btn-apple {
    background: #007AFF;
    color: #fff;
    border-color: #007AFF;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.25) inset, 0 8px 20px rgba(0, 122, 255, 0.22);
}
.cs-btn-apple:hover {
    background: #0071EB;
    border-color: #0071EB;
}


/* ─────────────────────────────────────────────
   § 10  INPUT SYSTEM
   ───────────────────────────────────────────── */

.cs-input,
.cs-textarea,
.cs-select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: var(--cs-text-sm);
    font-weight: 500;
    color: var(--cs-text-primary);
    background: var(--cs-surface-input);
    border: 1px solid var(--cs-border-default);
    border-radius: var(--cs-radius-md);
    outline: none;
    transition:
        background var(--cs-duration-normal) var(--cs-ease-spring),
        border-color var(--cs-duration-normal) var(--cs-ease-spring),
        box-shadow var(--cs-duration-normal) var(--cs-ease-spring);
}
.cs-input::placeholder,
.cs-textarea::placeholder {
    color: var(--cs-text-muted);
}
.cs-input:hover,
.cs-textarea:hover,
.cs-select:hover {
    background: rgba(0, 0, 0, 0.04);
}
.cs-input:focus,
.cs-input:focus-visible,
.cs-textarea:focus,
.cs-textarea:focus-visible,
.cs-select:focus,
.cs-select:focus-visible {
    background: var(--cs-bg-elevated);
    border-color: var(--cs-input-focus-border);
    box-shadow: var(--cs-input-focus-shadow);
}

.cs-textarea {
    resize: vertical;
    line-height: var(--cs-leading-relaxed);
    min-height: 5rem;
}

.cs-select {
    appearance: none;
    cursor: pointer;
}

/* Auth-style input: rounder, larger, Apple login feel */
.cs-input-auth {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: var(--cs-text-body);
    font-weight: 500;
    color: var(--cs-text-primary);
    background: rgba(0, 0, 0, 0.03);
    border: none;
    border-radius: var(--cs-radius-lg);
    outline: none;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
    transition:
        background var(--cs-duration-normal) var(--cs-ease-spring),
        box-shadow var(--cs-duration-normal) var(--cs-ease-spring);
}
.cs-input-auth::placeholder {
    color: var(--cs-text-muted);
}
.cs-input-auth:focus,
.cs-input-auth:focus-visible {
    background: var(--cs-bg-elevated);
    /* 与主输入系统同系品牌色；保留轻微内阴影避免「贴平」感 */
    box-shadow:
        var(--cs-input-focus-shadow),
        inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

/* Field label */
.cs-label {
    display: block;
    font-size: var(--cs-text-xs);
    font-weight: 700;
    color: var(--cs-text-muted);
    text-transform: uppercase;
    letter-spacing: var(--cs-tracking-caps);
    margin-bottom: 0.375rem;
}


/* ─────────────────────────────────────────────
   § 11  TOAST / STATUS SYSTEM
   ───────────────────────────────────────────── */

.cs-toast {
    background: rgba(255, 255, 255, 0.90);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.90);
    box-shadow: var(--cs-shadow-lg);
    border-radius: var(--cs-radius-md);
    padding: 0.75rem 1.5rem;
    font-size: var(--cs-text-sm);
    font-weight: 600;
    color: var(--cs-text-secondary);
}
.cs-toast-info    { border-left: 3px solid var(--cs-primary-400); }
.cs-toast-success { border-left: 3px solid var(--cs-success-500); }
.cs-toast-warn    { border-left: 3px solid var(--cs-warn-500); }
.cs-toast-error   { border-left: 3px solid var(--cs-danger-500); }

/* Semantic pills for teacher control state */
.cs-ctrl-active-rose   { background: var(--cs-danger-50)  !important; border-color: var(--cs-danger-400) !important; color: var(--cs-danger-600) !important; box-shadow: 0 0 12px var(--cs-danger-soft); }
.cs-ctrl-active-amber  { background: var(--cs-warn-50)    !important; border-color: var(--cs-warn-400)   !important; color: var(--cs-warn-600)   !important; box-shadow: 0 0 12px var(--cs-warn-soft); }
.cs-ctrl-active-violet { background: var(--cs-accent-50)  !important; border-color: var(--cs-accent-400) !important; color: var(--cs-accent-600) !important; box-shadow: 0 0 12px rgba(124, 58, 237, 0.07); }
.cs-ctrl-active-blue   { background: var(--cs-primary-50) !important; border-color: var(--cs-primary-200)!important; color: var(--cs-primary-600)!important; box-shadow: 0 0 12px rgba(37, 99, 235, 0.06); }


/* ─────────────────────────────────────────────
   § 12  AMBIENT BACKGROUND SYSTEM
   ───────────────────────────────────────────── */

/* Standard page background with restrained orbs */
.cs-bg-scene {
    background:
        radial-gradient(circle at 18% 22%, var(--cs-mesh-blue) 0%, transparent 34%),
        radial-gradient(circle at 82% 14%, var(--cs-mesh-violet) 0%, transparent 32%),
        radial-gradient(circle at 72% 76%, var(--cs-mesh-mint) 0%, transparent 34%),
        linear-gradient(180deg, #f8fbff 0%, #f3f6fb 48%, #eef3f9 100%);
    position: relative;
    overflow: hidden;
    transition: background 320ms var(--cs-ease-out);
}

.cs-bg-scene::before,
.cs-bg-scene::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.cs-bg-scene::before {
    background:
        radial-gradient(circle at 24% 18%, rgba(255, 255, 255, 0.72) 0%, transparent 28%),
        radial-gradient(circle at 76% 68%, rgba(255, 255, 255, 0.54) 0%, transparent 26%);
    filter: blur(10px);
    opacity: 0.9;
    transition: opacity 320ms var(--cs-ease-out);
}

.cs-bg-scene::after {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.22) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.18) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(circle at center, black 25%, transparent 88%);
    -webkit-mask-image: radial-gradient(circle at center, black 25%, transparent 88%);
    opacity: 0.32;
    transition: opacity 320ms var(--cs-ease-out);
}

/* Orb primitives — place inside .cs-bg-scene as child divs */
.cs-orb {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform;
}
.cs-orb-blue {
    width: 680px; height: 680px;
    background: radial-gradient(circle, rgba(171, 220, 255, 0.44) 0%, transparent 70%);
    filter: blur(110px);
    animation: csOrbDrift1 24s ease-in-out infinite;
    transition: opacity 320ms var(--cs-ease-out), filter 320ms var(--cs-ease-out);
}
.cs-orb-violet {
    width: 560px; height: 560px;
    background: radial-gradient(circle, rgba(214, 204, 255, 0.34) 0%, transparent 70%);
    filter: blur(118px);
    animation: csOrbDrift2 30s ease-in-out infinite;
    transition: opacity 320ms var(--cs-ease-out), filter 320ms var(--cs-ease-out);
}

.cs-bg-scene.cs-page-course {
    background:
        radial-gradient(circle at 18% 22%, rgba(153, 208, 255, 0.045) 0%, transparent 32%),
        radial-gradient(circle at 82% 14%, rgba(204, 188, 255, 0.035) 0%, transparent 30%),
        radial-gradient(circle at 72% 76%, rgba(176, 238, 220, 0.025) 0%, transparent 32%),
        linear-gradient(180deg, #fafbfd 0%, #f6f8fb 54%, #f2f4f7 100%);
}

.cs-bg-scene.cs-page-course::before {
    opacity: 0.18;
}

.cs-bg-scene.cs-page-course::after {
    opacity: 0.08;
}

.cs-bg-scene.cs-page-course .cs-orb-blue,
.cs-bg-scene.cs-page-course .cs-orb-violet {
    opacity: 0.1;
    filter: blur(144px);
}

.cs-floating-header-shell {
    width: min(100%, 1120px);
    margin: 0 auto;
    padding: 14px 16px;
    border-radius: 24px;
    position: relative;
}

.cs-floating-header-shell::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255,255,255,0.34), rgba(255,255,255,0.08));
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    padding: 1px;
}

/* ============ 课程大厅（018b：一屏固定 · 两板块上下排 · 专题横向滑动）============
   仅学生端使用（index.html / course-nav.js buildCourseLandingHTML）；教师端、备课端零依赖。
   版式纪律：整页不纵滚（矮屏 @media 兜底除外），信息克制——问候 + 一处日期 + 板块 + 卡片。
   cover（.cs-tc-cover）是纯容器：默认深墨底 + 白线稿，日后人工自绘封面整体替换其内容，
   卡片 chrome 恒为中性玻璃，accent 只出现在竖条/状态点/进度条/箭头等小元素上。 */
/* launch：大厅内容区随 4 板块增高（配合 style.css #learning-canvas 放开纵滚）；课程模式不受影响。 */
body.cs-page-landing #main-content-area { height: auto; min-height: 100%; }

.cs-hall-root {
    width: min(100%, 1200px);
    margin: 0 auto;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    padding-bottom: 8px;
}

/* ── 头区：顶栏(品牌) + 问候主视觉；冷调白底 + 一抹暖阳 ── */
.cs-hall-head {
    flex: 0 0 auto;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 2px 4px 26px;
}
/* 阳光明媚：右上一抹极淡晨光，落在冷调白底上——克制的氛围暖，非装饰光斑 */
.cs-hall-head::before {
    content: '';
    position: absolute;
    top: -46px;
    right: -24px;
    width: 360px;
    height: 240px;
    background: radial-gradient(58% 58% at 74% 26%, rgba(245, 158, 11, 0.11), rgba(245, 158, 11, 0) 72%);
    pointer-events: none;
    z-index: 0;
}
.cs-hall-head > * { position: relative; z-index: 1; }

/* 顶栏：品牌 logo + 字标左对齐成一条（右端 fixed 个人入口在视觉上收束这条栏） */
.cs-hall-topbar {
    display: flex;
    align-items: center;
    min-height: 44px;
}
.cs-hall-brand { display: flex; align-items: center; gap: 12px; }
.cs-hall-brand-logo {
    width: 40px;
    height: 40px;
    flex: none;
    border-radius: 11px;
    display: block;
    box-shadow: 0 8px 20px rgba(0, 60, 136, 0.22);
}
.cs-hall-brand-wm { display: flex; align-items: baseline; gap: 9px; }
.cs-hall-brand-wm b { font-size: 20px; font-weight: 800; letter-spacing: -0.01em; color: var(--cs-brand); }
.cs-hall-brand-wm i { font-style: normal; font-size: 11.5px; font-weight: 800; letter-spacing: 0.2em; color: var(--cs-text-muted); }

/* 问候主视觉：大标题做主角，日期做克制副行 */
.cs-hall-hero { display: flex; flex-direction: column; gap: 9px; }
.cs-hall-greet-ic {
    display: inline-flex;
    vertical-align: -0.16em;
    margin-right: 12px;
    color: var(--cs-warn-500);
}
.cs-hall-greet-ic svg { width: 30px; height: 30px; display: block; }
.cs-hall-title {
    margin: 0;
    font-size: clamp(1.9rem, 1.4rem + 1.7vw, 2.7rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
}
/* 姓名：品牌墨蓝实色（收敛装饰、不用渐变文字） */
.cs-hall-name { color: var(--cs-brand); }
.cs-hall-sub {
    margin: 0;
    padding-left: 2px;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--cs-text-tertiary);
    letter-spacing: 0.01em;
}
.cs-hall-sub b {
    font-weight: 800;
    color: var(--cs-text-secondary);
    font-feature-settings: 'tnum' 1;
}

/* ── 顶栏个人入口（fixed 右上，全学生页通用）：液态玻璃胶囊，只留姓名 + 箭头（不要头像圆圈） ── */
.cs-user-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 46px;
    padding: 0 18px;
    border-radius: 999px;
    /* 液态玻璃：半透明白渐变 + 强 blur/saturate，背后卡片色在胶囊里鲜活流动 */
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.34));
    backdrop-filter: blur(22px) saturate(180%);
    -webkit-backdrop-filter: blur(22px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.65);
    box-shadow:
        inset 0 1px 0.5px rgba(255, 255, 255, 0.95),
        inset 0 -8px 14px -8px rgba(255, 255, 255, 0.45),
        0 8px 24px rgba(15, 23, 42, 0.1),
        0 2px 5px rgba(15, 23, 42, 0.04);
    cursor: pointer;
    transition: box-shadow 240ms var(--cs-ease-out), transform 240ms var(--cs-ease-out), border-color 240ms var(--cs-ease-out), background 240ms var(--cs-ease-out);
}
.cs-user-pill:hover {
    transform: translateY(-1px);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.46));
    border-color: rgba(255, 255, 255, 0.85);
    box-shadow:
        inset 0 1px 0.5px rgba(255, 255, 255, 1),
        inset 0 -8px 14px -8px rgba(255, 255, 255, 0.55),
        0 12px 30px rgba(15, 23, 42, 0.12),
        0 3px 8px rgba(15, 23, 42, 0.05);
}

/* 下拉面板：同一套液态玻璃语言（更实一点保证菜单文字可读） */
.cs-menu-panel {
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.66));
    backdrop-filter: blur(30px) saturate(185%);
    -webkit-backdrop-filter: blur(30px) saturate(185%);
    border: 1px solid rgba(255, 255, 255, 0.7);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.9),
        0 18px 44px rgba(15, 23, 42, 0.16),
        0 4px 12px rgba(15, 23, 42, 0.07);
}
.cs-user-pill:focus-visible { outline: 2px solid var(--cs-primary-400); outline-offset: 2px; }
.cs-user-name {
    margin-left: 2px;
    max-width: 9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
    font-weight: 700;
    color: var(--cs-text-secondary);
}
.cs-user-chev {
    width: 15px;
    height: 15px;
    flex: none;
    color: var(--cs-text-muted);
    transition: transform 200ms var(--cs-ease-out);
}
.cs-user-pill[aria-expanded="true"] .cs-user-chev { transform: rotate(180deg); }

/* ── 下拉菜单项：统一白底，hover 品牌淡蓝；退出登录用危险色 ── */
.cs-menu-item {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    padding: 11px 13px;
    border-radius: var(--cs-radius-md);
    font-size: 13.5px;
    font-weight: 700;
    color: var(--cs-text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background 160ms var(--cs-ease-out), color 160ms var(--cs-ease-out);
}
.cs-menu-item:hover { background: var(--cs-primary-50); color: var(--cs-brand); }
.cs-menu-item svg { width: 16px; height: 16px; color: var(--cs-text-muted); flex: none; }
.cs-menu-item:hover svg { color: var(--cs-brand); }
.cs-menu-item-danger:hover { background: var(--cs-danger-50); color: var(--cs-danger-600); }
.cs-menu-item-danger:hover svg { color: var(--cs-danger-600); }

/* ── 入场编排：头区/继续条/各板块依次浮现（一次性、只动 transform/opacity）── */
.cs-hall-rise {
    animation: csHallRise 0.55s var(--cs-ease-spring) both;
    animation-delay: calc(var(--rise, 0) * 70ms);
}
@keyframes csHallRise {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── 继续学习（018b 小胶囊条：便利入口，不当主角）── */
.cs-hall-resume {
    align-self: flex-start;
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin: 0 6px 16px;
    height: 40px;
    padding: 0 15px 0 8px;
    border-radius: var(--cs-radius-full);
    cursor: pointer;
    font-family: inherit;
    max-width: calc(100% - 12px);
    background: var(--cs-bg-elevated);
    border: 1px solid var(--cs-hairline);
    box-shadow: var(--cs-shadow-sm);
    transition:
        transform 240ms var(--cs-ease-spring),
        box-shadow 240ms var(--cs-ease-out),
        border-color 240ms var(--cs-ease-out);
}
.cs-hall-resume:hover {
    transform: translateY(-1px);
    border-color: color-mix(in srgb, var(--cs-primary-500) 30%, var(--cs-hairline));
    box-shadow: var(--cs-shadow-md);
}
.cs-hall-resume:active { transform: scale(0.985); }
.cs-hall-resume:focus-visible {
    outline: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.92), 0 0 0 3px var(--accent-soft, rgba(0, 98, 214, 0.12));
}
.cs-hr-ic {
    flex: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: #fff;
    background: linear-gradient(150deg, var(--accent-from, var(--cs-primary-500)), var(--accent-to, var(--cs-brand)));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.36);
}
.cs-hr-ic svg { width: 14px; height: 14px; }
.cs-hr-label {
    flex: none;
    font-size: var(--cs-text-xs);
    font-weight: 800;
    letter-spacing: 0.05em;
    color: var(--cs-text-muted);
}
.cs-hr-title {
    min-width: 0;
    font-size: var(--cs-text-sm);
    font-weight: 800;
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.cs-hr-arrow {
    flex: none;
    width: 14px;
    height: 14px;
    color: var(--accent-text, var(--cs-primary-600));
    transition: transform 300ms var(--cs-ease-out);
}
.cs-hall-resume:hover .cs-hr-arrow { transform: translateX(3px); }

/* ── 板块区：两大板块上下平分剩余高度，整页不滚 ── */
/* launch：整页纵向滚动（外壳 learning-canvas 本就 overflow-y-auto）——板块随内容自然增高，
   不再撑满一屏 flex 平分，彻底解决「卡片被压矮 + 副标题截断」。 */
.cs-hall-body {
    display: flex;
    flex-direction: column;
    gap: 32px;
    padding: 0 0 16px;
}

.cs-board {
    display: flex;
    flex-direction: column;
    gap: 13px;
}

.cs-board-head {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 6px 0 2px;
}

.cs-board-bar {
    flex: 0 0 auto;
    width: 4px;
    height: 18px;
    border-radius: var(--cs-radius-full);
    background: linear-gradient(180deg, var(--accent-from), var(--accent-to));
}

.cs-board-title {
    flex: 0 0 auto;
    font-size: var(--cs-text-h3);
    font-weight: 800;
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
}

.cs-board-line {
    flex: 1 1 auto;
    height: 1px;
    margin: 0 2px;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.09), rgba(15, 23, 42, 0.012));
}

.cs-board-meta {
    flex: 0 0 auto;
    font-size: var(--cs-text-xs);
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--cs-text-muted);
    font-feature-settings: 'tnum' 1;
}

/* 专题行：横向滑动（鼠标滚轮由 course-nav 转横滑，触摸板原生横扫），半露卡片自然提示「还有更多」 */
.cs-board-row {
    display: flex;
    gap: 18px;
    overflow-x: auto;
    overflow-y: hidden;
    overscroll-behavior-x: contain;
    scroll-snap-type: x proximity;
    padding: 6px 6px 14px 2px;
    scrollbar-width: thin;
    scrollbar-color: rgba(21, 42, 80, 0.18) transparent;
}
/* 横滑拖条：可见但精致（小毅要「看到左右滑动的拖条」——去掉了 no-scrollbar 隐藏） */
.cs-board-row::-webkit-scrollbar { height: 9px; }
.cs-board-row::-webkit-scrollbar-thumb {
    background: rgba(21, 42, 80, 0.16);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
}
.cs-board-row::-webkit-scrollbar-thumb:hover { background: rgba(21, 42, 80, 0.3); background-clip: padding-box; }
.cs-board-row::-webkit-scrollbar-track { background: transparent; }

/* ── 专题卡 = 课程海报：上半幅深墨 cover（构图/未来自绘封面），下半幅中性玻璃信息区 ── */
.cs-topic-card-btn {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    cursor: pointer;
    padding: 0;
    flex: 0 0 300px;
    scroll-snap-align: start;
    border-radius: 22px;
    display: flex;
    flex-direction: column;
    text-align: left;
    font-family: inherit;
    background: linear-gradient(170deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.46));
    backdrop-filter: blur(var(--cs-glass-blur)) saturate(var(--cs-glass-saturate));
    -webkit-backdrop-filter: blur(var(--cs-glass-blur)) saturate(var(--cs-glass-saturate));
    border: 1px solid rgba(255, 255, 255, 0.74);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), var(--cs-shadow-sm);
    transition:
        transform 380ms var(--cs-ease-spring),
        box-shadow 380ms var(--cs-ease-spring),
        border-color 380ms var(--cs-ease-out);
}

.cs-topic-card-btn:hover {
    transform: translateY(-4px);
    border-color: color-mix(in srgb, var(--accent-to) 26%, rgba(255, 255, 255, 0.74));
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.95),
        0 20px 40px rgba(15, 23, 42, 0.11),
        0 0 0 1px var(--accent-soft);
}

.cs-topic-card-btn:active { transform: translateY(-2px) scale(0.995); }

.cs-topic-card-btn:focus-visible {
    outline: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.95), 0 0 0 3px var(--accent-soft), var(--cs-shadow-sm);
}

/* cover：深墨底 + 白线稿（蓝图气质）；高度吃掉卡片剩余空间，大屏更大气 */
/* cover：明快 accent 渐变底 + 白线稿（launch 撤深墨 ink——「青春明媚阳光」）；固定海报高 */
.cs-tc-cover {
    position: relative;
    flex: none;
    height: 150px;
    overflow: hidden;
    background:
        radial-gradient(130% 100% at 84% -14%, rgba(255, 255, 255, 0.30), transparent 56%),
        linear-gradient(140deg, var(--accent-from, #4E93F2), var(--accent-to, #2E7BE4));
}

.cs-tc-art {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.cs-tc-art svg {
    width: 100%;
    height: 100%;
    display: block;
    transform: scale(1.03);
    transition: transform 900ms var(--cs-ease-out);
}
.cs-topic-card-btn:hover .cs-tc-art svg { transform: scale(1.08); }

/* 细噪点：深墨底上的「印刷颗粒」（无 blur，开销≈0） */
.cs-tc-noise {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.1;
    mix-blend-mode: soft-light;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* hover 扫光：深墨上收敛到微光 */
.cs-tc-shine {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(105deg, transparent 42%, rgba(255, 255, 255, 0.14) 50%, transparent 58%);
    transform: translateX(-130%);
}
.cs-topic-card-btn:hover .cs-tc-shine {
    transform: translateX(130%);
    transition: transform 750ms var(--cs-ease-out);
}

/* 课数徽章：cover 右上角细玻璃胶囊 */
.cs-tc-count {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--cs-radius-full);
    font-size: 10.5px;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: rgba(255, 255, 255, 0.92);
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.26);
    font-feature-settings: 'tnum' 1;
}

.cs-tc-body {
    position: relative;
    z-index: 1;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 16px 12px;
}

.cs-tc-title {
    font-size: 15px;
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: var(--cs-tracking-tight);
    color: var(--cs-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 副标题：允许两行、不截断（launch 小毅反馈：字被截断）；固定两行高保持卡片等高 */
.cs-tc-sub {
    font-size: var(--cs-text-xs);
    font-weight: 500;
    line-height: 1.5;
    color: var(--cs-text-tertiary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.5em;
}

.cs-tc-foot {
    margin-top: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

/* 学习状态：默认「待探索」；hydrate 注入课级进度后亮起 accent */
.cs-tc-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: var(--cs-text-xs);
    font-weight: 700;
    color: var(--cs-text-muted);
    font-feature-settings: 'tnum' 1;
}
.cs-tc-status::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: var(--cs-radius-full);
    background: var(--cs-text-ghost);
}
.cs-topic-card-btn[data-progress] .cs-tc-status { color: var(--accent-text); }
.cs-topic-card-btn[data-progress] .cs-tc-status::before {
    background: var(--accent-to);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* 进入箭头钮：文字省掉，方向即语义 */
.cs-tc-go {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: var(--accent-text);
    background: var(--accent-soft);
    transition: transform 300ms var(--cs-ease-out);
}
.cs-tc-go svg { width: 14px; height: 14px; }
.cs-topic-card-btn:hover .cs-tc-go { transform: translateX(3px); }

/* 底缘进度条：有进度才浮现 */
.cs-tc-bar {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    background: rgba(15, 23, 42, 0.05);
    opacity: 0;
    transition: opacity 400ms var(--cs-ease-out);
}
.cs-tc-bar i {
    display: block;
    height: 100%;
    width: 0;
    border-radius: 0 2px 2px 0;
    background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
    transition: width 700ms var(--cs-ease-out);
}
.cs-topic-card-btn[data-progress] .cs-tc-bar { opacity: 1; }

/* 空板块占位：一行，撑满行高居中 */
.cs-board-empty {
    flex: 1 1 auto;
    min-height: 0;
    align-self: stretch;
    display: grid;
    place-items: center;
    border-radius: 22px;
    border: 1px dashed rgba(148, 163, 184, 0.40);
    background: rgba(255, 255, 255, 0.26);
    font-size: var(--cs-text-sm);
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--cs-text-muted);
}

/* tester 磨课「重置本课」浮钮：右下角低调灰胶囊，仅测试账号出现（course-engine 注入），hover 显现 */
.cs-tester-reset {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 70;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 14px 8px 11px;
    border-radius: 999px;
    font-family: inherit;
    font-size: 12.5px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(150deg, #64748B, #475569);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.24), inset 0 1px 0 rgba(255, 255, 255, 0.22);
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 200ms var(--cs-ease-out), transform 200ms var(--cs-ease-out);
}
.cs-tester-reset:hover { opacity: 1; transform: translateY(-1px); }
.cs-tester-reset:active { transform: translateY(0); }
.cs-tester-reset svg { width: 15px; height: 15px; }

/* 矮屏兜底（小笔记本）：一屏排不下时退化为纵向滚动，不挤爆 */
@media (max-height: 660px) {
    .cs-hall-body { overflow-y: auto; }
    .cs-board { flex: 0 0 auto; }
    .cs-board-row { min-height: 212px; }
}

@media (max-width: 640px) {
    .cs-topic-card-btn { flex-basis: 256px; }
}

/* 窄屏：品牌英文副标让位给右侧 fixed 个人胶囊，避免顶栏拥挤（保留 logo + 智瞰） */
@media (max-width: 520px) {
    .cs-hall-brand-wm i { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .cs-hall-rise { animation: none !important; }
    .cs-tc-art svg, .cs-tc-shine, .cs-tc-bar i, .cs-tc-go, .cs-hr-arrow { transition: none !important; }
}

@keyframes csOrbDrift1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(35px, -20px) scale(1.03); }
    66% { transform: translate(-18px, 12px) scale(0.98); }
}
@keyframes csOrbDrift2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(-25px, 25px) scale(0.94); }
    66% { transform: translate(22px, -12px) scale(1.02); }
}



/* ─────────────────────────────────────────────
   § 13  UTILITY CLASSES
   ───────────────────────────────────────────── */

.cs-no-scrollbar::-webkit-scrollbar { display: none; }
.cs-no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

/* Smooth appearance */
.cs-anim-in {
    animation: csFadeIn var(--cs-duration-slow) var(--cs-ease-spring) both;
}
@keyframes csFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.cs-anim-toast {
    animation: csToastSlide 0.35s var(--cs-ease-spring) both;
}
@keyframes csToastSlide {
    from { opacity: 0; transform: translateY(-10px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* Focus ring for accessibility (keyboard nav) */
.cs-focus-ring:focus-visible {
    outline: 2px solid var(--cs-primary-400);
    outline-offset: 2px;
}


/* ─────────────────────────────────────────────
   § 14  RESPONSIVE TOUCH SCALING
   Standardized touch-target sizing for iPad
   ───────────────────────────────────────────── */

@media (min-width: 768px) and (max-width: 1366px) and (pointer: coarse) {
    [class*="cs-btn"] {
        min-height: 48px;
        padding: 0.65rem 1rem;
        font-size: var(--cs-text-body);
    }
    .cs-input,
    .cs-textarea,
    .cs-select {
        min-height: 48px;
        padding: 0.65rem 1rem;
        font-size: var(--cs-text-body);
    }
}