/* ============================================================
   GHZ FX VARIABLES — CSS variables + animation keyframes cho hệ
   thống hiệu ứng thời tiết. Tách khỏi theme-vars.css để dễ bật/tắt
   và không làm ảnh hưởng đến các theme hiện có.

   File này:
   - Khai báo CSS variables cho FX layer + brand accent.
   - Định nghĩa keyframes cho 9 hiệu ứng (rain, snow, fog, stars,
     leaves, fireflies, bubbles, embers, none).
   - Ép GPU compositor (translateZ(0) + will-change + contain).
   - Pause animation khi tab ẩn (Page Visibility).

   Không đụng đến theme-vars.css, theme-engine.js, index.html chỗ
   khác. Chỉ cần include file này 1 lần trong <head>.
   ============================================================ */

/* ===== FX LAYER ===== */
#ghz-fx-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
    /* ép lên GPU compositor, tránh CPU repaint */
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    contain: strict;
}
#ghz-fx-layer > * { pointer-events: none; }

/* pause animation khi tab ẩn (tiết kiệm pin trên di động) */
html[data-paused="true"] #ghz-fx-layer,
html[data-paused="true"] #ghz-fx-layer * {
    animation-play-state: paused !important;
}

/* reduce-motion: tự tắt animation cho user thiết bị yếu / accessibility */
@media (prefers-reduced-motion: reduce) {
    #ghz-fx-layer,
    #ghz-fx-layer * {
        animation: none !important;
    }
}

/* ===== Rain ===== */
.ghz-fx-rain-drop {
    position: absolute;
    width: 2px;
    height: 18px;
    background: linear-gradient(180deg, rgba(180,210,255,0) 0%, rgba(180,210,255,0.85) 100%);
    border-radius: 2px;
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-rain-fall linear infinite;
}
@keyframes ghz-fx-rain-fall {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -20px, 0); opacity: 0; }
    10%  { transform: translate3d(var(--ghz-rx, 0px), 5vh, 0); opacity: 1; }
    100% { transform: translate3d(var(--ghz-rx, 0px), 105vh, 0); opacity: 0.6; }
}

/* ===== Snow ===== */
.ghz-fx-snow-flake {
    position: absolute;
    color: #fff;
    text-shadow: 0 0 6px rgba(255,255,255,0.5);
    user-select: none;
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-snow-fall linear infinite;
}
@keyframes ghz-fx-snow-fall {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -30px, 0) rotate(0deg); opacity: 0; }
    10%  { transform: translate3d(var(--ghz-rx, 0px), 8vh, 0) rotate(36deg); opacity: 1; }
    50%  { transform: translate3d(calc(20px + var(--ghz-rx, 0px)), 50vh, 0) rotate(180deg); }
    100% { transform: translate3d(calc(-20px + var(--ghz-rx, 0px)), 105vh, 0) rotate(360deg); opacity: 0.7; }
}

/* ===== Fog (slow drifting overlay) — REMOVED 2026-09-28 =====
.ghz-fx-fog { ... } — đã xóa khỏi picker, không dùng nữa.
*/

/* ===== Stars (twinkling) ===== */
.ghz-fx-star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 0 4px rgba(255,255,255,0.8);
    will-change: opacity, transform;
    transform: translateZ(0);
    animation: ghz-fx-star-twink ease-in-out infinite;
}
@keyframes ghz-fx-star-twink {
    0%, 100% { opacity: 0.2; transform: scale(0.8); }
    50%      { opacity: 1;   transform: scale(1.4); }
}

/* ===== Falling leaves ===== */
.ghz-fx-leaf {
    position: absolute;
    font-size: 18px;
    user-select: none;
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-leaf-fall linear infinite;
}
@keyframes ghz-fx-leaf-fall {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -40px, 0) rotate(0deg); opacity: 0; }
    10%  { transform: translate3d(var(--ghz-rx, 0px), 8vh, 0) rotate(36deg); opacity: 1; }
    50%  { transform: translate3d(calc(-30px + var(--ghz-rx, 0px)), 50vh, 0) rotate(180deg); }
    100% { transform: translate3d(calc(30px + var(--ghz-rx, 0px)), 105vh, 0) rotate(360deg); opacity: 0.8; }
}

/* ===== Fireflies (floating glowing dots) ===== */
.ghz-fx-firefly {
    position: absolute;
    width: 6px;
    height: 6px;
    background: #ffe066;
    border-radius: 50%;
    box-shadow:
        0 0 8px #ffe066,
        0 0 16px rgba(255,224,102,0.6);
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-firefly-float ease-in-out infinite;
}
@keyframes ghz-fx-firefly-float {
    0%   { transform: translate(0, 0); opacity: 0; }
    20%  { opacity: 1; }
    50%  { transform: translate(60px, -40px); opacity: 0.8; }
    100% { transform: translate(-40px, 30px); opacity: 0; }
}

/* ===== Bubbles (rising) ===== */
.ghz-fx-bubble {
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.7), rgba(255,255,255,0.1));
    border: 1px solid rgba(255,255,255,0.4);
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-bubble-rise ease-in infinite;
}
@keyframes ghz-fx-bubble-rise {
    0%   { transform: translateY(0) translateX(0) scale(0.6); opacity: 0; }
    10%  { opacity: 0.8; }
    50%  { transform: translateY(-50vh) translateX(30px) scale(1); }
    100% { transform: translateY(-105vh) translateX(-20px) scale(0.5); opacity: 0; }
}

/* ===== Ember/sparks (rising warm dots) ===== */
.ghz-fx-ember {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #fb923c;
    box-shadow: 0 0 8px rgba(251,146,60,0.8), 0 0 12px rgba(239,68,68,0.5);
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-ember-rise linear infinite;
}
@keyframes ghz-fx-ember-rise {
    0%   { transform: translateY(0) translateX(0); opacity: 0; }
    15%  { opacity: 1; }
    100% { transform: translateY(-105vh) translateX(40px); opacity: 0; }
}

/* ============================================================
   FX PICKER UI — chip grid trong tab "Của tôi"
   ============================================================ */
.ghz-fx-picker-wrap {
    margin-top: 14px;
    padding: 16px;
    border-radius: 12px;
    background: var(--ghz-card-bg, rgba(255,255,255,0.04));
    border: 1px solid var(--ghz-card-border, rgba(255,255,255,0.08));
    color: var(--ghz-text-primary, #f7fafc);
}
.ghz-fx-picker-wrap h3 {
    font-size: 14px;
    font-weight: 700;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}
.ghz-fx-picker-wrap h3::before {
    content: '';
    width: 4px;
    height: 16px;
    border-radius: 2px;
    background: var(--ghz-brand-color, #00c37a);
}
.ghz-fx-picker-wrap p {
    font-size: 12px;
    color: var(--ghz-text-muted, #9ca3af);
    margin: 4px 0 12px;
}
.ghz-fx-current {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(0,195,122,0.12);
    border: 1px solid rgba(0,195,122,0.3);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ghz-brand-color, #00c37a);
}
.ghz-fx-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
    gap: 8px;
    margin-top: 12px;
}
.ghz-fx-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 12px 6px;
    border-radius: 10px;
    background: var(--ghz-card-glass-bg, rgba(255,255,255,0.05));
    border: 1px solid var(--ghz-card-glass-border, rgba(255,255,255,0.10));
    cursor: pointer;
    transition: transform .15s ease, border-color .15s ease, background .15s ease;
    text-align: center;
    color: var(--ghz-text-primary, #e5e7eb);
    font-size: 12px;
    font-weight: 500;
    user-select: none;
}
.ghz-fx-chip:hover {
    transform: translateY(-2px);
    background: var(--ghz-card-glass-bg-hover, rgba(255,255,255,0.10));
}
.ghz-fx-chip.selected {
    border-color: var(--ghz-brand-color, #00c37a);
    background: rgba(255,255,255,0.12);
    color: var(--ghz-text-primary, #f7fafc);
    box-shadow: 0 0 0 2px rgba(0,0,0,0.4), 0 0 0 4px var(--ghz-brand-color, #00c37a);
}
.ghz-fx-chip .ghz-fx-icon {
    font-size: 22px;
    line-height: 1;
}
.ghz-fx-toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
    flex-wrap: wrap;
}
.ghz-fx-density {
    flex: 1 1 200px;
    max-width: 320px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255,255,255,0.15);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}
.ghz-fx-density::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--ghz-brand-color, #00c37a);
    border: 2px solid #ffffff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
    cursor: pointer;
}
.ghz-fx-density::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--ghz-brand-color, #00c37a);
    border: 2px solid #ffffff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
    cursor: pointer;
}
.ghz-fx-reset {
    padding: 7px 14px;
    background: rgba(255,255,255,0.85) !important;
    border: 2px solid rgba(0,0,0,0.2) !important;
    color: #1f2937 !important;
    border-radius: 8px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 700;
    transition: all .15s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18), inset 0 1px 0 rgba(255,255,255,0.8);
}
.ghz-fx-reset:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.22), inset 0 1px 0 rgba(255,255,255,0.9);
}
.ghz-fx-density-val {
    display: inline-block;
    min-width: 30px;
    text-align: center;
    font-size: 12px;
    color: var(--ghz-text-muted, #9ca3af);
    font-weight: 600;
}
.ghz-fx-toolbar label {
    font-size: 12px;
    color: var(--ghz-text-secondary, #e2e8f0);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* Toast thông báo (khi đổi FX) — dùng style riêng để không xung đột với toast hệ thống */
.ghz-fx-toast {
    position: fixed;
    left: 50%;
    bottom: 80px;
    transform: translateX(-50%);
    z-index: 9999;
    padding: 10px 16px;
    background: rgba(20,20,20,0.92);
    color: #fff;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 600;
    box-shadow: 0 6px 20px rgba(0,0,0,0.35);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    pointer-events: none;
    opacity: 0;
    transition: opacity .25s ease, transform .25s ease;
}
.ghz-fx-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============================================================
   FX #10 — CONFETTI (pháo giấy màu) — CSS-only
   ============================================================ */
.ghz-fx-confetti {
    position: absolute;
    top: 0;
    left: 0;
    width: 8px;
    height: 12px;
    background: #ef4444; /* mặc định — bị override inline */
    will-change: transform;
    transform: translate3d(0, 0, 0);
    contain: layout paint style;
    animation: ghz-fx-confetti-fall 5s linear infinite;
}

/* Shapes */
.ghz-fx-confetti.ghz-fx-shape-circle {
    border-radius: 50%;
}
.ghz-fx-confetti.ghz-fx-shape-strip {
    width: 4px;
    height: 18px;
}

/* Foil gradients (≈33% particle) */
.ghz-fx-confetti.ghz-fx-foil-gold {
    background: linear-gradient(135deg,
        #fbbf24 0%, #fde047 50%, #fbbf24 100%);
}
.ghz-fx-confetti.ghz-fx-foil-silver {
    background: linear-gradient(135deg,
        #d1d5db 0%, #fafafa 50%, #d1d5db 100%);
}
.ghz-fx-confetti.ghz-fx-foil-pink {
    background: linear-gradient(135deg,
        #f472b6 0%, #fbcfe8 50%, #f472b6 100%);
}

/* Drift variants (trái / phải) */
.ghz-fx-confetti.ghz-fx-drift-left {
    animation-name: ghz-fx-confetti-fall-left;
}
.ghz-fx-confetti.ghz-fx-drift-right {
    animation-name: ghz-fx-confetti-fall-right;
}

/* Keyframes — chỉ rotate Z + translate để GPU nhẹ */
@keyframes ghz-fx-confetti-fall {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -10vh, 0) rotate(0deg); }
    100% { transform: translate3d(var(--ghz-rx, 0px), 110vh, 0) rotate(720deg); }
}
@keyframes ghz-fx-confetti-fall-left {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -10vh, 0) rotate(0deg); }
    100% { transform: translate3d(calc(-25vw + var(--ghz-rx, 0px)), 110vh, 0) rotate(720deg); }
}
@keyframes ghz-fx-confetti-fall-right {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -10vh, 0) rotate(0deg); }
    100% { transform: translate3d(calc(25vw + var(--ghz-rx, 0px)), 110vh, 0) rotate(720deg); }
}

/* Pause animation khi tab ẩn */
html[data-paused="true"] .ghz-fx-confetti {
    animation-play-state: paused;
}
/* ============================================================
   DANDELION (#8) — hat bo cong anh troi bay len troi
   ============================================================ */
.ghz-fx-dandelion {
    position: absolute;
    width: 12px;
    height: 12px;
    user-select: none;
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: ghz-fx-dandelion-drift linear infinite;
}
.ghz-fx-dandelion::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, #ffffff 0%, #ffffff 30%, transparent 70%);
    border-radius: 50%;
}
.ghz-fx-dandelion::after {
    /* Tia tua trang quanh hat */
    content: '';
    position: absolute;
    left: 50%; top: 50%;
    width: 10px; height: 1.5px;
    background: linear-gradient(to right, transparent, #ffffff, transparent);
    transform: translate(-50%, -50%) rotate(45deg);
    box-shadow:
        0 0 0 0 #fff,
        -8px 0 0 -1px #fff,
        8px 0 0 -1px #fff,
        0 -8px 0 -1px #fff,
        0 8px 0 -1px #fff,
        -6px -6px 0 -1px #fff,
        6px 6px 0 -1px #fff,
        -6px 6px 0 -1px #fff,
        6px -6px 0 -1px #fff;
}
@keyframes ghz-fx-dandelion-drift {
    0%   { transform: translateY(0) translateX(0) rotate(0deg); opacity: 0; }
    10%  { opacity: 0.9; }
    50%  { transform: translateY(-40vh) translateX(50px) rotate(180deg); }
    100% { transform: translateY(-105vh) translateX(-30px) rotate(360deg); opacity: 0.7; }
}
html[data-paused="true"] .ghz-fx-dandelion {
    animation-play-state: paused;
}

/* ============================================================
   AURORA (#9) — dai sang gradient xanh-tim chuyen dong
   ============================================================ */
.ghz-fx-aurora-band {
    position: absolute;
    left: -50%;
    width: 200%;
    height: 60vh;
    background: linear-gradient(120deg,
        transparent 0%,
        rgba(74,222,128,0.25) 30%,
        rgba(34,211,238,0.30) 50%,
        rgba(139,92,246,0.28) 70%,
        transparent 100%);
    will-change: transform, opacity;
    animation: ghz-fx-aurora-shift ease-in-out infinite;
    mix-blend-mode: screen;
}
@keyframes ghz-fx-aurora-shift {
    0%, 100% { transform: translateX(0) translateY(0); opacity: 0.5; }
    50%      { transform: translateX(15%) translateY(-10%); opacity: 0.9; }
}
html[data-paused="true"] .ghz-fx-aurora-band {
    animation-play-state: paused;
}

/* ============================================================
   SAKURA (#11) — canh hoa pastel roi (hong / trang / vang)
   ============================================================ */
.ghz-fx-sakura {
    position: absolute;
    width: 14px; height: 14px;
    background: radial-gradient(circle at 50% 50%, #f9a8d4 0%, #f472b6 60%, #ec4899 100%);
    border-radius: 50% 0 50% 50%;
    transform: rotate(45deg);
    will-change: transform, opacity;
    animation: ghz-fx-sakura-drift linear infinite;
    filter: drop-shadow(0 1px 1px rgba(190,24,93,0.2));
}
.ghz-fx-sakura.var-white  { background: radial-gradient(circle at 50% 50%, #fff 0%, #fbcfe8 100%); }
.ghz-fx-sakura.var-deep   { background: radial-gradient(circle at 50% 50%, #f9a8d4 0%, #db2777 100%); }
.ghz-fx-sakura.var-yellow { background: radial-gradient(circle at 50% 50%, #fde68a 0%, #f59e0b 100%); }

@keyframes ghz-fx-sakura-drift {
    0%   { transform: translateY(-40px) rotate(45deg) translateX(0); opacity: 0; }
    10%  { opacity: 0.9; }
    50%  { transform: translateY(50vh) rotate(225deg) translateX(80px); }
    100% { transform: translateY(105vh) rotate(765deg) translateX(-50px); opacity: 0.8; }
}
html[data-paused="true"] .ghz-fx-sakura {
    animation-play-state: paused;
}

/* ============================================================
   HANABI (#12) — sao cross-flare cao cap, 4 tia + multi-glow
   ============================================================ */
.ghz-fx-hanabi {
    position: absolute;
    width: 4px; height: 4px;
    background: var(--star-color, #fff);
    border-radius: 50%;
    will-change: opacity, transform;
    animation: ghz-fx-hanabi-twink ease-in-out infinite;
    box-shadow:
        0 0 4px var(--star-color, #fff),
        0 0 10px var(--star-color, #fff),
        0 0 18px var(--star-color, #fff),
        0 0 30px var(--star-color, #fff);
}
.ghz-fx-hanabi::before,
.ghz-fx-hanabi::after {
    content: '';
    position: absolute;
    background: linear-gradient(0deg, transparent 0%, var(--star-color, #fff) 50%, transparent 100%);
    will-change: opacity, transform;
}
.ghz-fx-hanabi::before {
    left: 50%; top: -16px;
    width: 1px; height: 32px;
    transform: translateX(-50%);
    animation: ghz-fx-hanabi-flare-y ease-in-out infinite;
}
.ghz-fx-hanabi::after {
    top: 50%; left: -16px;
    width: 32px; height: 1px;
    transform: translateY(-50%);
    animation: ghz-fx-hanabi-flare-x ease-in-out infinite;
}
@keyframes ghz-fx-hanabi-twink {
    0%, 100% { opacity: 0.15; transform: scale(0.4); }
    50%      { opacity: 1;    transform: scale(1.6); }
}
@keyframes ghz-fx-hanabi-flare-y {
    0%, 100% { opacity: 0;    height: 6px; }
    50%      { opacity: 0.95; height: 38px; }
}
@keyframes ghz-fx-hanabi-flare-x {
    0%, 100% { opacity: 0;    width: 6px; }
    50%      { opacity: 0.95; width: 38px; }
}
.ghz-fx-hanabi.major {
    width: 6px; height: 6px;
}
.ghz-fx-hanabi.major::before {
    top: -28px; height: 60px;
    background: linear-gradient(0deg, transparent 0%, var(--star-color, #fff) 50%, transparent 100%);
}
.ghz-fx-hanabi.major::after {
    left: -28px; width: 60px;
    background: linear-gradient(90deg, transparent 0%, var(--star-color, #fff) 50%, transparent 100%);
}
html[data-paused="true"] .ghz-fx-hanabi {
    animation-play-state: paused;
}

/* ============================================================
   LIGHT-RAIN (#13) — mua bui nhe, giot nho day, roi cham
   ============================================================ */
.ghz-fx-drizzle {
    position: absolute;
    width: 1.5px; height: 12px;
    background: linear-gradient(180deg, transparent 0%, rgba(186,230,253,0.85) 100%);
    border-radius: 50%;
    will-change: transform, opacity;
    animation: ghz-fx-drizzle-fall linear infinite;
}
@keyframes ghz-fx-drizzle-fall {
    0%   { transform: translate3d(var(--ghz-rx, 0px), -20px, 0); opacity: 0; }
    10%  { transform: translate3d(var(--ghz-rx, 0px), 8vh, 0); opacity: 1; }
    100% { transform: translate3d(calc(10px + var(--ghz-rx, 0px)), 105vh, 0); opacity: 0.6; }
}
html[data-paused="true"] .ghz-fx-drizzle {
    animation-play-state: paused;
}
/* ============================================================
   PETALS (#11) — canh hoa don gian roi thang tu dinh
   ============================================================ */
.ghz-fx-petal {
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50% 0 50% 50%;
    /* base transform chỉ rotate; animation sẽ override bằng rotate+translate */
    will-change: transform, opacity;
    animation: ghz-fx-petal-fall linear infinite;
    /* filter drop-shadow cho solid variant */
    filter: drop-shadow(0 1px 1px rgba(190,24,93,0.15));
    /* chống selection/drag text khi user kéo chuột qua */
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
}
.ghz-fx-petal.glyph {
    /* glyph variant: KHÔNG dùng border-radius (emoji đã có shape riêng),
       KHÔNG background; để emoji hiển thị full size trong box 18×18 */
    background: transparent !important;
    border-radius: 0;
    filter: drop-shadow(0 1px 1px rgba(190,24,93,0.2));
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    /* ép font-size = box để emoji được render ở kích thước tối đa */
    font-size: 18px;
}
@keyframes ghz-fx-petal-fall {
    0%   { transform: rotate(45deg) translate3d(var(--ghz-rx, 0px), var(--ghz-ry, 0px), 0); opacity: 0; }
    8%   { transform: rotate(63deg) translate3d(calc(0px + var(--ghz-rx, 0px)), calc(2vh + var(--ghz-ry, 0px)), 0); opacity: 1; }
    50%  { transform: rotate(225deg) translate3d(calc(15px + var(--ghz-rx, 0px)), calc(55vh + var(--ghz-ry, 0px)), 0); }
    92%  { transform: rotate(383deg) translate3d(calc(2px + var(--ghz-rx, 0px)), calc(101vh + var(--ghz-ry, 0px)), 0); opacity: 1; }
    100% { transform: rotate(405deg) translate3d(calc(-10px + var(--ghz-rx, 0px)), calc(110vh + var(--ghz-ry, 0px)), 0); opacity: 0; }
}
html[data-paused="true"] .ghz-fx-petal {
    animation-play-state: paused;
}

/* ============================================================
   CONFETTI-LITE (#12) — engine rAF, particle pool
   CSS toi uu: chi translate + rotate, khong transition/opacity
   ============================================================ */
.ghz-fx-confetti-lite {
    position: fixed;
    top: 0;
    left: 0;
    width: 8px;
    height: 12px;
    background: #ef4444; /* mac dinh */
    will-change: transform;
    transform: translate3d(0, 0, 0);
    /* khong co transition/animation -> engine dieu khien qua JS */
}
.ghz-fx-confetti-lite.circle {
    border-radius: 50%;
}
.ghz-fx-confetti-lite.strip {
    width: 4px;
    height: 18px;
}
/* Foil: 4 gradient dinh san (giam gradient dynamic, nhe GPU) */
.ghz-fx-confetti-lite.foil-gold {
    background: linear-gradient(135deg, #fbbf24 0%, #fde047 50%, #fbbf24 100%);
}
.ghz-fx-confetti-lite.foil-silver {
    background: linear-gradient(135deg, #d1d5db 0%, #fafafa 50%, #d1d5db 100%);
}
.ghz-fx-confetti-lite.foil-pink {
    background: linear-gradient(135deg, #f472b6 0%, #fbcfe8 50%, #f472b6 100%);
}
.ghz-fx-confetti-lite.foil-blue {
    background: linear-gradient(135deg, #38bdf8 0%, #bae6fd 50%, #38bdf8 100%);
}