/* Genius Design System — Bright Classroom (English Education) */
:root {
    /* Surfaces — cool light, not warm beige */
    --g-bg-base: #f0f5fc;
    --g-bg-surface: #ffffff;
    --g-bg-elevated: #f8fafc;
    --g-bg-muted: #eef2f9;
    --g-bg-glass: rgba(255, 255, 255, 0.88);
    --g-bg-glass-light: rgba(255, 255, 255, 0.65);

    /* Primary accent — cobalt blue (education) */
    --g-primary: #2563eb;
    --g-primary-hover: #1d4ed8;
    --g-primary-light: #eff6ff;
    --g-primary-dim: rgba(37, 99, 235, 0.12);
    --g-primary-ring: rgba(37, 99, 235, 0.28);

    /* Secondary warm — gamification energy */
    --g-coral: #f97316;
    --g-coral-light: #fff7ed;
    --g-coral-dim: rgba(249, 115, 22, 0.12);

    /* Module palette — harmonized, readable on light */
    --g-sky: #0ea5e9;
    --g-emerald: #059669;
    --g-violet: #7c3aed;
    --g-amber: #d97706;
    --g-rose: #e11d48;
    --g-indigo: #4f46e5;
    --g-gold: #ca8a04;

    /* Legacy aliases (pages may reference these) */
    --g-cyan: var(--g-sky);
    --g-cyan-dim: rgba(14, 165, 233, 0.12);
    --g-bg-deep: var(--g-bg-base);
    --g-bg-space: var(--g-bg-muted);
    --g-surface: var(--g-bg-surface);
    --g-violet-dim: rgba(124, 58, 237, 0.1);

    /* Typography */
    --g-text: #0f172a;
    --g-text-secondary: #475569;
    --g-text-muted: #64748b;
    --g-text-on-primary: #ffffff;
    --g-font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --g-font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    /* Borders & elevation */
    --g-border: #e2e8f0;
    --g-border-strong: #cbd5e1;
    --g-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
    --g-shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
    --g-shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08);
    --g-shadow-primary: 0 4px 14px rgba(37, 99, 235, 0.22);
    --g-glow-cyan: var(--g-shadow-primary);
    --g-glow-coral: 0 4px 14px rgba(249, 115, 22, 0.2);

    /* Typography scale */
    --g-text-xs: 0.75rem;
    --g-text-sm: 0.8125rem;
    --g-text-base: 0.9375rem;
    --g-text-lg: 1.0625rem;
    --g-text-xl: 1.25rem;
    --g-text-2xl: 1.5rem;
    --g-leading-tight: 1.35;
    --g-leading-normal: 1.6;
    --g-leading-relaxed: 1.75;

    /* Shape — cards 16px, inputs 12px, buttons pill */
    --g-radius: 16px;
    --g-radius-sm: 12px;
    --g-radius-xs: 8px;
    --g-transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Motion (respect reduced motion) ── */
@keyframes g-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes g-shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

@keyframes g-pulse-ring {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.04); opacity: 0.85; }
}

@keyframes g-drift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(2%, -1.5%) scale(1.03); }
}

@keyframes g-letter-float {
    0%, 100% { transform: translateY(0) rotate(-3deg); opacity: 0.06; }
    50% { transform: translateY(-12px) rotate(3deg); opacity: 0.1; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ── Buttons ── */
.g-btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 24px;
    border: none;
    border-radius: 999px;
    font-family: var(--g-font-display);
    font-weight: 600;
    font-size: 14px;
    color: var(--g-text-on-primary);
    background: var(--g-primary);
    box-shadow: var(--g-shadow-primary);
    cursor: pointer;
    transition: var(--g-transition);
    text-decoration: none;
    white-space: nowrap;
}
.g-btn-primary:hover {
    background: var(--g-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}
.g-btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.g-btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border: 1px solid var(--g-border-strong);
    border-radius: 999px;
    font-family: var(--g-font-display);
    font-weight: 600;
    font-size: 14px;
    color: var(--g-text-secondary);
    background: var(--g-bg-surface);
    cursor: pointer;
    transition: var(--g-transition);
    text-decoration: none;
}
.g-btn-secondary:hover {
    border-color: var(--g-primary);
    color: var(--g-primary);
    background: var(--g-primary-light);
}

/* ── Button component system (admin / student) ── */
.g-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 0;
    border: 1px solid transparent;
    cursor: pointer;
    font-family: var(--g-font-display);
    font-weight: 600;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    box-sizing: border-box;
    transition: var(--g-transition);
    -webkit-tap-highlight-color: transparent;
}

.g-btn:focus-visible {
    outline: 2px solid var(--g-primary);
    outline-offset: 2px;
}

.g-btn:disabled,
.g-btn.is-disabled {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
}

.g-btn svg.g-btn-svg {
    width: 1em;
    height: 1em;
    flex-shrink: 0;
}

/* Sizes */
.g-btn--sm,
.btn-primary.g-btn--sm {
    padding: 7px 14px !important;
    font-size: var(--g-text-xs) !important;
    min-height: 32px;
}

.g-btn--md {
    padding: 10px 20px;
    font-size: 14px;
    border-radius: 999px;
    min-height: 40px;
}

.g-btn--lg {
    padding: 12px 24px;
    font-size: 15px;
    border-radius: 999px;
    min-height: 44px;
}

/* Variants */
.g-btn--primary {
    background: var(--g-primary);
    color: var(--g-text-on-primary);
    border-color: var(--g-primary);
    box-shadow: var(--g-shadow-primary);
}

.g-btn--primary:hover {
    background: var(--g-primary-hover);
    border-color: var(--g-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.28);
}

.g-btn--primary:active {
    transform: translateY(0) scale(0.98);
}

.g-btn--danger {
    background: #fef2f2;
    color: #b91c1c;
    border-color: #fecaca;
}

.g-btn--danger:hover {
    background: #fee2e2;
    border-color: #fca5a5;
    color: #991b1b;
}

.g-btn--danger:active {
    transform: scale(0.98);
}

.g-btn--ghost {
    background: var(--g-bg-surface);
    color: var(--g-text-secondary);
    border-color: var(--g-border-strong);
}

.g-btn--ghost:hover {
    color: var(--g-primary);
    border-color: rgba(37, 99, 235, 0.25);
    background: var(--g-primary-light);
}

/* Icon-only action buttons (delete, etc.) */
.g-btn--icon {
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    border-radius: 10px;
    flex-shrink: 0;
}

.g-btn--icon .g-btn-svg {
    width: 1.125rem;
    height: 1.125rem;
}

.g-btn--icon-danger {
    background: var(--g-bg-surface);
    color: #94a3b8;
    border: 1px solid var(--g-border);
    box-shadow: var(--g-shadow-sm);
}

.g-btn--icon-danger:hover {
    color: #dc2626;
    background: #fef2f2;
    border-color: #fecaca;
    box-shadow: none;
    transform: none;
}

.g-btn--icon-danger:active {
    transform: scale(0.94);
    background: #fee2e2;
}

/* ── Cards ── */
.g-glass-card {
    background: var(--g-bg-surface);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius);
    box-shadow: var(--g-shadow-md);
}

.g-surface-card {
    background: var(--g-bg-elevated);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius-sm);
}

/* ── Logo ── */
.genius-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--g-bg-surface);
    object-fit: cover;
    box-shadow: var(--g-shadow-sm), 0 0 0 2px var(--g-primary-dim);
}

/* ── English letter decoration (background motif) ── */
.g-letter-bg {
    position: relative;
    overflow: hidden;
}
.g-letter-bg::before {
    content: 'A B C Read Write Listen Speak';
    position: absolute;
    top: -20px;
    right: -10%;
    font-family: var(--g-font-display);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    color: var(--g-primary);
    opacity: 0.04;
    letter-spacing: 0.08em;
    white-space: nowrap;
    pointer-events: none;
    animation: g-letter-float 8s ease-in-out infinite;
}

/* ── Skill tag pills ── */
.g-skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 999px;
    font-family: var(--g-font-display);
    font-size: 12px;
    font-weight: 600;
    background: var(--g-primary-light);
    color: var(--g-primary);
    border: 1px solid rgba(37, 99, 235, 0.15);
}

/* ── Form base (shared) ── */
.g-input {
    width: 100%;
    padding: 11px 14px;
    border-radius: var(--g-radius-sm);
    border: 1px solid var(--g-border-strong);
    background: var(--g-bg-surface);
    color: var(--g-text);
    font-family: var(--g-font-body);
    font-size: 14px;
    transition: var(--g-transition);
}
.g-input:focus {
    outline: none;
    border-color: var(--g-primary);
    box-shadow: 0 0 0 3px var(--g-primary-dim);
}
.g-input::placeholder {
    color: var(--g-text-muted);
}

/* 2026 app refresh tokens */
:root {
    --g-bg-base: #edf3fb;
    --g-bg-surface: #ffffff;
    --g-bg-elevated: #f6f9fd;
    --g-bg-muted: #e8eef7;
    --g-bg-glass: rgba(255, 255, 255, 0.92);
    --g-bg-glass-light: rgba(255, 255, 255, 0.72);
    --g-primary: #1d4ed8;
    --g-primary-hover: #1e40af;
    --g-primary-light: #eaf2ff;
    --g-primary-dim: rgba(29, 78, 216, 0.12);
    --g-primary-ring: rgba(29, 78, 216, 0.24);
    --g-mint: #0f766e;
    --g-mint-light: #e6fffb;
    --g-coral: #ea580c;
    --g-coral-light: #fff2e8;
    --g-text: #102033;
    --g-text-secondary: #40546c;
    --g-text-muted: #6b7d92;
    --g-border: #d9e3ef;
    --g-border-strong: #bfd0e4;
    --g-shadow-sm: 0 1px 2px rgba(16, 32, 51, 0.05);
    --g-shadow-md: 0 10px 26px rgba(16, 32, 51, 0.07);
    --g-shadow-lg: 0 18px 46px rgba(16, 32, 51, 0.11);
    --g-shadow-primary: 0 10px 22px rgba(29, 78, 216, 0.20);
    --g-radius: 16px;
    --g-radius-sm: 12px;
    --g-radius-xs: 8px;
}