/* =====================================================================
   Sam奧數遊戲 - UI components library
   Buttons, cards, forms, badges, progress, toasts, modals, etc.
   ===================================================================== */

/* ---------- Buttons ---------- */
.btn {
    --btn-bg: var(--c-bg-3);
    --btn-fg: var(--c-text-0);
    --btn-glow: var(--glow-cyan);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-6);
    border-radius: var(--r-full);
    border: 1px solid rgba(255,255,255,0.12);
    background: var(--btn-bg);
    color: var(--btn-fg);
    font-family: var(--font-display);
    font-weight: var(--fw-bold);
    font-size: var(--fs-md);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform var(--dur-fast) var(--ease-spring),
                box-shadow var(--dur-norm) var(--ease-out-quart),
                border-color var(--dur-norm);
    user-select: none;
    text-decoration: none;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.18), transparent);
    transform: translateX(-100%);
    transition: transform var(--dur-slow) var(--ease-out-quart);
}

.btn:hover {
    transform: translateY(-2px);
    border-color: rgba(255,255,255,0.35);
    box-shadow: var(--btn-glow);
}
.btn:hover::before { transform: translateX(100%); }

.btn:active { transform: translateY(0) scale(0.98); }
.btn:focus-visible {
    outline: 3px solid var(--c-neon-cyan);
    outline-offset: 3px;
}
.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-primary {
    --btn-bg: linear-gradient(135deg, var(--c-neon-cyan), var(--c-neon-violet));
    --btn-fg: var(--c-text-on-neon);
    --btn-glow: var(--glow-cyan);
}
.btn-magenta {
    --btn-bg: linear-gradient(135deg, var(--c-neon-magenta), var(--c-neon-violet));
    --btn-fg: var(--c-text-0);
    --btn-glow: var(--glow-magenta);
}
.btn-gold {
    --btn-bg: linear-gradient(135deg, var(--c-neon-gold), #ff8a00);
    --btn-fg: var(--c-text-on-neon);
    --btn-glow: var(--glow-gold);
}
.btn-ghost {
    --btn-bg: transparent;
    --btn-fg: var(--c-text-1);
    --btn-glow: 0 0 24px rgba(0,240,255,0.3);
}
.btn-danger {
    --btn-bg: linear-gradient(135deg, var(--c-neon-red), #b00020);
    --btn-fg: var(--c-text-0);
    --btn-glow: 0 0 24px rgba(255,59,48,0.55);
}

.btn-lg { padding: var(--sp-4) var(--sp-8); font-size: var(--fs-lg); }
.btn-sm { padding: var(--sp-2) var(--sp-4); font-size: var(--fs-sm); }
.btn-block { display: flex; width: 100%; }

/* ---------- Cards ---------- */
.card {
    background: var(--grad-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--r-lg);
    padding: var(--sp-6);
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}
.card-glow::after {
    content: "";
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, var(--c-neon-cyan), transparent 30%, transparent 70%, var(--c-neon-magenta));
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* ---------- Forms ---------- */
.field { margin-bottom: var(--sp-4); }
.field label {
    display: block;
    margin-bottom: var(--sp-2);
    font-size: var(--fs-sm);
    color: var(--c-text-2);
    font-weight: var(--fw-medium);
}
.input, .select, .textarea {
    width: 100%;
    padding: var(--sp-3) var(--sp-4);
    background: rgba(10,14,39,0.6);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--r-md);
    color: var(--c-text-0);
    font-size: var(--fs-md);
    transition: border-color var(--dur-norm), box-shadow var(--dur-norm);
}
.input:focus, .select:focus, .textarea:focus {
    outline: none;
    border-color: var(--c-neon-cyan);
    box-shadow: 0 0 0 3px rgba(0,240,255,0.18);
}
.input::placeholder { color: var(--c-text-3); }

/* ---------- Badges ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-1);
    padding: 2px var(--sp-3);
    border-radius: var(--r-full);
    font-size: var(--fs-xs);
    font-weight: var(--fw-bold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: rgba(0,240,255,0.15);
    color: var(--c-neon-cyan);
    border: 1px solid rgba(0,240,255,0.4);
}
.badge-gold { background: rgba(255,214,10,0.15); color: var(--c-neon-gold); border-color: rgba(255,214,10,0.4); }
.badge-magenta { background: rgba(255,45,146,0.15); color: var(--c-neon-magenta); border-color: rgba(255,45,146,0.4); }
.badge-violet { background: rgba(175,82,222,0.15); color: var(--c-neon-violet); border-color: rgba(175,82,222,0.4); }
.badge-success { background: rgba(52,199,89,0.15); color: var(--c-success); border-color: rgba(52,199,89,0.4); }
.badge-danger { background: rgba(255,59,48,0.15); color: var(--c-danger); border-color: rgba(255,59,48,0.4); }

/* ---------- Progress ---------- */
.progress {
    width: 100%;
    height: 12px;
    background: rgba(255,255,255,0.08);
    border-radius: var(--r-full);
    overflow: hidden;
    position: relative;
}
.progress-bar {
    height: 100%;
    background: var(--grad-neon);
    border-radius: inherit;
    transition: width var(--dur-slow) var(--ease-out-quart);
    position: relative;
}
.progress-bar::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 2s linear infinite;
}
@keyframes shimmer {
    from { transform: translateX(-100%); }
    to   { transform: translateX(100%); }
}

/* ---------- Toast ---------- */
.toast-container {
    position: fixed;
    top: var(--sp-6);
    right: var(--sp-6);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
    pointer-events: none;
}
.toast {
    padding: var(--sp-3) var(--sp-5);
    border-radius: var(--r-md);
    background: var(--c-bg-2);
    color: var(--c-text-0);
    border-left: 4px solid var(--c-neon-cyan);
    box-shadow: var(--shadow-pop);
    min-width: 240px;
    max-width: 360px;
    pointer-events: auto;
    animation: toast-in var(--dur-norm) var(--ease-spring);
}
.toast-success { border-color: var(--c-success); }
.toast-error { border-color: var(--c-danger); }
.toast-warn { border-color: var(--c-warning); }
@keyframes toast-in {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
.toast.out { animation: toast-out var(--dur-norm) var(--ease-in-out-quart) forwards; }
@keyframes toast-out {
    to { transform: translateX(120%); opacity: 0; }
}

/* ---------- Modal ---------- */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(6,8,24,0.85);
    backdrop-filter: blur(8px);
    z-index: 9000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--sp-4);
    animation: fade-in var(--dur-norm);
}
.modal {
    background: var(--grad-card);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--r-xl);
    padding: var(--sp-8);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-pop);
    animation: modal-pop var(--dur-slow) var(--ease-spring);
}
@keyframes fade-in { from { opacity: 0; } }
@keyframes modal-pop {
    from { transform: scale(0.85) translateY(20px); opacity: 0; }
    to   { transform: scale(1) translateY(0); opacity: 1; }
}

/* ---------- Star rating ---------- */
.stars {
    display: inline-flex;
    gap: var(--sp-1);
}
.star {
    width: 28px; height: 28px;
    color: rgba(255,214,10,0.2);
    transition: color var(--dur-norm), transform var(--dur-norm) var(--ease-spring);
}
.star.lit {
    color: var(--c-neon-gold);
    filter: drop-shadow(0 0 6px rgba(255,214,10,0.7));
}
.star.lit.pop { animation: star-pop var(--dur-slow) var(--ease-spring); }
@keyframes star-pop {
    0% { transform: scale(0); }
    60% { transform: scale(1.4); }
    100% { transform: scale(1); }
}

/* ---------- Chapter chip ---------- */
.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-1) var(--sp-3);
    border-radius: var(--r-full);
    font-size: var(--fs-xs);
    font-weight: var(--fw-bold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* ---------- Coin counter (number rolling) ---------- */
.coin {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    font-family: var(--font-num);
    color: var(--c-neon-gold);
    font-weight: var(--fw-black);
}

/* ---------- Section divider ---------- */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,240,255,0.4), transparent);
    margin-block: var(--sp-12);
    position: relative;
}

/* ---------- Tooltip ---------- */
[data-tooltip] {
    position: relative;
    cursor: help;
}
[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--c-bg-3);
    color: var(--c-text-0);
    padding: var(--sp-1) var(--sp-2);
    border-radius: var(--r-sm);
    white-space: nowrap;
    font-size: var(--fs-xs);
    box-shadow: var(--shadow-card);
    z-index: 100;
}