/* ========================================
   F.3 Weighted Score Calculator
   Style inspired by Cyrclo (cyrclo.webflow.io)
   Dark + Light theme · Bold typography · ✦
   ======================================== */

/* ---------- Reset ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ---------- Dark Theme (default) ---------- */
:root {
    --bg:            #0a0a0a;
    --bg-card:       #141414;
    --bg-card-hover: #1a1a1a;
    --bg-input:      #1e1e1e;
    --text:          #f5f5f5;
    --text-muted:    #888888;
    --text-dim:      #555555;
    --accent:        #c8f750;
    --accent-text:   #0a0a0a;
    --accent-dim:    rgba(200, 247, 80, 0.12);
    --accent-glow:   rgba(200, 247, 80, 0.3);
    --border:        rgba(255, 255, 255, 0.08);
    --border-hover:  rgba(255, 255, 255, 0.15);
    --nav-bg:        rgba(10, 10, 10, 0.8);
    --nav-bg-scroll: rgba(10, 10, 10, 0.95);
    --hero-glow-1:   rgba(200, 247, 80, 0.06);
    --hero-glow-2:   rgba(200, 247, 80, 0.04);
    --shadow:        rgba(0, 0, 0, 0.3);
    --radius:        20px;
    --radius-sm:     12px;
    --font:          'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width:     1200px;
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
    --bg:            #f7f7f5;
    --bg-card:       #ffffff;
    --bg-card-hover: #f0f0ee;
    --bg-input:      #f0f0ee;
    --text:          #1a1a1a;
    --text-muted:    #666666;
    --text-dim:      #999999;
    --accent:        #4d8c0f;
    --accent-text:   #ffffff;
    --accent-dim:    rgba(77, 140, 15, 0.1);
    --accent-glow:   rgba(77, 140, 15, 0.2);
    --border:        rgba(0, 0, 0, 0.08);
    --border-hover:  rgba(0, 0, 0, 0.15);
    --nav-bg:        rgba(247, 247, 245, 0.8);
    --nav-bg-scroll: rgba(247, 247, 245, 0.95);
    --hero-glow-1:   rgba(77, 140, 15, 0.05);
    --hero-glow-2:   rgba(77, 140, 15, 0.03);
    --shadow:        rgba(0, 0, 0, 0.08);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    transition: background 0.4s ease, color 0.4s ease;
}

[data-lang="zh"] body {
    font-family: 'Noto Sans TC', var(--font);
}

a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.star { color: var(--accent); }

/* ---------- Navigation ---------- */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.4s ease, border-color 0.4s ease;
}

.nav.nav--scrolled {
    background: var(--nav-bg-scroll);
}

.nav__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.nav__logo {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.nav__links {
    display: flex;
    gap: 36px;
    flex: 1;
    justify-content: center;
}

.nav__link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s;
    position: relative;
}

.nav__link:hover { color: var(--text); }

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

.nav__link:hover::after { width: 100%; }

/* Nav Actions (theme + lang toggles) */
.nav__actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav__icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px; height: 38px;
    border-radius: 10px;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.nav__icon-btn:hover {
    color: var(--text);
    background: var(--bg-input);
}

/* Show sun in dark mode, moon in light mode */
.icon { display: none; }
[data-theme="dark"] .icon--sun { display: block; }
[data-theme="light"] .icon--moon { display: block; }

.nav__lang-btn {
    padding: 7px 14px;
    border-radius: 10px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav__lang-btn:hover {
    color: var(--text);
    border-color: var(--border-hover);
    background: var(--bg-input);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 6px;
}

.nav__toggle span {
    width: 22px; height: 2px;
    background: var(--text);
    border-radius: 2px;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.btn--primary {
    background: var(--accent);
    color: var(--accent-text);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.btn--ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border-hover);
}

.btn--ghost:hover {
    background: var(--bg-input);
    border-color: var(--text-muted);
}

.btn--full {
    width: 100%;
    margin-top: 24px;
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: 160px 0 80px;
    text-align: center;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, var(--hero-glow-1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, var(--hero-glow-2) 0%, transparent 50%);
    pointer-events: none;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border: 1px solid var(--border-hover);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 32px;
    background: var(--bg-card);
}

.hero__title {
    font-size: clamp(2.8rem, 8vw, 6rem);
    font-weight: 900;
    line-height: 0.95;
    letter-spacing: -0.04em;
    margin-bottom: 28px;
}

.hero__title-accent {
    color: var(--accent);
}

.hero__subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- Marquee ---------- */
.marquee {
    overflow: hidden;
    padding: 24px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-top: 60px;
    -webkit-mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
    mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.marquee__track {
    display: flex;
    gap: 0;
    animation: marquee 30s linear infinite;
    white-space: nowrap;
}

.marquee__track span {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dim);
    letter-spacing: -0.02em;
}

@keyframes marquee {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}

/* ---------- Calculator Layout ---------- */
.calculator {
    padding: 100px 0;
}

.calculator__grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    align-items: start;
}

.calculator__inputs {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* ---------- Card ---------- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.3s ease, background 0.4s ease;
}

.card:hover {
    border-color: var(--border-hover);
}

.card__header {
    padding: 24px 28px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.card__tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 5px 14px;
    border-radius: 100px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    white-space: nowrap;
}

.card__title {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.card__body {
    padding: 24px 28px 28px;
}

.card--english .english-papers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ---------- Field ---------- */
.field {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.field:last-child {
    border-bottom: none;
}

.field__label {
    flex: 1;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.field__weight {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 2px 8px;
    border-radius: 6px;
    white-space: nowrap;
}

/* Score + Full Mark Input Group */
.field__score-group {
    display: flex;
    align-items: center;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg-input);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field__score-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.field__input {
    width: 72px;
    padding: 10px 8px;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 600;
    text-align: center;
    -moz-appearance: textfield;
}

.field__input::-webkit-outer-spin-button,
.field__input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.field__input::placeholder {
    color: var(--text-dim);
    font-weight: 400;
}

.field__input:focus {
    outline: none;
}

.field__separator {
    color: var(--text-dim);
    font-size: 0.85rem;
    padding: 0 2px;
    user-select: none;
}

.field__fullmark {
    width: 56px;
    padding: 10px 8px;
    background: var(--bg-card-hover);
    border: none;
    border-left: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
    -moz-appearance: textfield;
    transition: color 0.2s;
}

.field__fullmark::-webkit-outer-spin-button,
.field__fullmark::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.field__fullmark:focus {
    outline: none;
    color: var(--text);
}

.field__result {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent);
    min-width: 50px;
    text-align: right;
}

/* ---------- English Subtotal ---------- */
.english-subtotal {
    margin-top: 20px;
    padding: 16px 20px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.english-subtotal__row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.english-subtotal__row--accent {
    border-top: 1px solid var(--border);
    margin-top: 6px;
    padding-top: 12px;
    color: var(--text);
    font-weight: 700;
    font-size: 1rem;
}

.english-subtotal__row--accent span:last-child {
    color: var(--accent);
}

/* ---------- Card Subtotal ---------- */
.card__subtotal {
    margin-top: 16px;
    padding: 14px 20px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.card__subtotal span:last-child {
    color: var(--accent);
    font-weight: 700;
    font-size: 1rem;
}

/* ---------- Results Panel ---------- */
.calculator__results {
    position: sticky;
    top: 90px;
}

.results-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    position: relative;
    overflow: hidden;
    transition: background 0.4s ease, border-color 0.4s ease;
}

.results-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
}

.results-panel__header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 24px;
}

/* Grand Total */
.grand-total {
    text-align: center;
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.grand-total__label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.grand-total__value {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.04em;
    color: var(--accent);
    transition: transform 0.3s ease;
}

.grand-total__value.bump {
    transform: scale(1.05);
}

/* Breakdown */
.results-breakdown__title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.results-breakdown__list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.results-breakdown__item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    font-size: 0.88rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    transition: color 0.2s;
}

.results-breakdown__item:last-child {
    border-bottom: none;
}

.results-breakdown__item span:last-child {
    color: var(--text);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.results-breakdown__item.has-value span:last-child {
    color: var(--accent);
}

.results-breakdown__item.has-value span:first-child {
    color: var(--text);
}

/* Bar Chart */
.results-bar {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.results-bar__title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 14px;
}

.results-bar__chart {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.results-bar__bar {
    display: flex;
    height: 8px;
    border-radius: 100px;
    overflow: hidden;
    background: var(--bg-input);
    gap: 2px;
}

.results-bar__segment {
    height: 100%;
    transition: all 0.4s ease;
    min-width: 0;
}

.results-bar__legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    margin-top: 14px;
}

.results-bar__legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.results-bar__legend-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ---------- How It Works ---------- */
.how-it-works {
    padding: 100px 0;
    border-top: 1px solid var(--border);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header__eyebrow {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.section-header__title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.05;
}

.how-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.how-card {
    padding: 32px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.how-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px var(--shadow);
}

.how-card__num {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.how-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.how-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
    border-top: 1px solid var(--border);
}

.marquee--footer {
    border-top: none;
    border-bottom: 1px solid var(--border);
    margin-top: 0;
}

.footer__inner {
    padding: 48px 24px;
    text-align: center;
}

.footer__logo {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.footer__text {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.footer__copy {
    font-size: 0.8rem;
    color: var(--text-dim);
}

/* ---------- Responsive ---------- */
@media (max-width: 968px) {
    .calculator__grid {
        grid-template-columns: 1fr;
    }

    .calculator__results {
        position: relative;
        top: 0;
        order: -1;
    }

    .how-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav__links {
        display: none;
        position: absolute;
        top: 100%; left: 0; right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border);
        padding: 0 24px;
    }

    .nav__links--open {
        display: flex;
    }

    .nav__links .nav__link {
        padding: 16px 0;
        border-bottom: 1px solid var(--border);
    }

    .nav__toggle {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .hero__actions .btn {
        width: 100%;
        max-width: 320px;
    }

    .card--english .english-papers {
        grid-template-columns: 1fr;
    }

    .how-grid {
        grid-template-columns: 1fr;
    }

    .field {
        flex-wrap: wrap;
    }

    .field__label {
        flex: 1 1 100%;
    }

    .field__score-group {
        margin-left: auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .card__header {
        padding: 20px 20px 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .card__body {
        padding: 20px;
    }

    .grand-total__value {
        font-size: 2.8rem;
    }
}


/* ================================================
   ANIMATIONS — Professional Polish Layer
   ================================================ */

/* ---------- Keyframes ---------- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes slideDown {
    from { transform: translateY(-100%); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-4px); }
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50%      { background-position: 100% 50%; }
}

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

@keyframes spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-12px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes growWidth {
    from { width: 0; }
}

@keyframes pulseGlow {
    0%, 100% { text-shadow: 0 0 20px var(--accent-glow); }
    50%      { text-shadow: 0 0 40px var(--accent-glow), 0 0 60px var(--accent-glow); }
}

/* ---------- Page Load Entrance ---------- */
.nav {
    animation: slideDown 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero__badge {
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
}

.hero__title {
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.25s both;
}

.hero__subtitle {
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.4s both;
}

.hero__actions {
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.5s both;
}

.marquee {
    animation: fadeIn 1s ease 0.6s both;
}

/* ---------- Hero Background Breathing ---------- */
.hero__bg {
    background-size: 200% 200%;
    animation: gradientShift 12s ease-in-out infinite;
}

/* ---------- Floating Star ---------- */
.star {
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

/* ---------- Scroll Reveal System ---------- */
.reveal {
    opacity: 0;
    translate: 0 40px;
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                translate 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, translate;
}

.reveal--visible {
    opacity: 1;
    translate: 0 0;
}

.reveal--delay-1 { transition-delay: 0.08s; }
.reveal--delay-2 { transition-delay: 0.16s; }
.reveal--delay-3 { transition-delay: 0.24s; }
.reveal--delay-4 { transition-delay: 0.32s; }

/* Results panel slide-in from right */
.results-panel.reveal {
    translate: 30px 0;
}

.results-panel.reveal--visible {
    translate: 0 0;
}

/* ---------- Card Mouse-Follow Glow ---------- */
.card {
    position: relative;
}

.card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    background: radial-gradient(circle 250px at var(--glow-x, 50%) var(--glow-y, 50%),
                var(--accent-dim), transparent 50%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    z-index: 0;
}

.card--glowing::after {
    opacity: 1;
}

.card > * {
    position: relative;
    z-index: 1;
}

/* ---------- Results Panel Shimmer Bar ---------- */
.results-panel::before {
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    background-size: 200% 100%;
    animation: shimmer 4s ease-in-out infinite;
}

/* ---------- Bar Chart Grow + Legend Fade ---------- */
.results-bar__segment {
    animation: growWidth 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.results-bar__legend-item {
    animation: fadeInUp 0.4s ease both;
}

.results-bar__legend-item:nth-child(1) { animation-delay: 0.1s; }
.results-bar__legend-item:nth-child(2) { animation-delay: 0.15s; }
.results-bar__legend-item:nth-child(3) { animation-delay: 0.2s; }
.results-bar__legend-item:nth-child(4) { animation-delay: 0.25s; }
.results-bar__legend-item:nth-child(5) { animation-delay: 0.3s; }
.results-bar__legend-item:nth-child(6) { animation-delay: 0.35s; }
.results-bar__legend-item:nth-child(7) { animation-delay: 0.4s; }

/* ---------- Enhanced Hover: Nav Icon Spin ---------- */
.nav__icon-btn .icon {
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav__icon-btn:hover .icon {
    transform: rotate(180deg);
}

/* ---------- Enhanced Hover: Lang Button Sweep ---------- */
.nav__lang-btn {
    overflow: hidden;
    position: relative;
}

.nav__lang-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
    opacity: 0.1;
    z-index: -1;
}

.nav__lang-btn:hover::after {
    transform: scaleX(1);
}

/* ---------- Breakdown Item Slide-In ---------- */
.results-breakdown__item {
    transition: opacity 0.3s ease, color 0.2s;
}

.results-breakdown__item.has-value {
    animation: slideInLeft 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* ---------- Grand Total Glow ---------- */
.grand-total__value {
    text-shadow: 0 0 30px var(--accent-glow);
    animation: pulseGlow 4s ease-in-out infinite;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.grand-total__value.bump {
    transform: scale(1.08);
}

/* ---------- Button Ripple ---------- */
.btn {
    position: relative;
    overflow: hidden;
    transition: all 0.25s ease, box-shadow 0.3s ease;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    width: 0; height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
    pointer-events: none;
}

.btn:active::after {
    width: 300px; height: 300px;
    transition: 0s;
}

/* ---------- Enhanced Input Focus ---------- */
.field__score-group {
    transition: border-color 0.2s ease, box-shadow 0.3s ease;
}

.field__score-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim), 0 0 20px var(--accent-dim);
}

/* ---------- How Card Sweep ---------- */
.how-card {
    position: relative;
    overflow: hidden;
}

.how-card::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
    transition: left 0.6s ease;
    pointer-events: none;
    z-index: 0;
}

.how-card:hover::before {
    left: 100%;
}

.how-card > * {
    position: relative;
    z-index: 1;
}

/* ---------- Card Enhanced Hover ---------- */
.card {
    transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px var(--shadow);
}

/* ---------- Nav Link Underline Enhancement ---------- */
.nav__link::after {
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Section Header Entrance ---------- */
.section-header__eyebrow {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* ---------- English Subtotal Accent ---------- */
.english-subtotal__row--accent span:last-child,
.card__subtotal span:last-child {
    transition: color 0.2s ease;
}

/* ---------- Results Panel Entrance ---------- */
.results-panel {
    animation: scaleIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.3s both;
}

/* ---------- Reset Button Hover ---------- */
#resetBtn {
    transition: all 0.25s ease;
}

#resetBtn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ---------- Enhanced Card: 3D Tilt + Hover ---------- */
.card {
    transform: perspective(1000px) rotateX(var(--tilt-x, 0deg)) rotateY(var(--tilt-y, 0deg));
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                translate 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.3s ease,
                transform 0.15s ease-out,
                box-shadow 0.3s ease;
}

.card:hover {
    transform: perspective(1000px) rotateX(var(--tilt-x, 0deg)) rotateY(var(--tilt-y, 0deg)) translateY(-4px);
    box-shadow: 0 16px 48px var(--shadow);
}

/* ---------- Magnetic Buttons ---------- */
.btn {
    transform: translate(var(--magnet-x, 0px), var(--magnet-y, 0px));
    transition: all 0.25s ease, transform 0.15s ease-out, box-shadow 0.3s ease;
}

.btn--primary:hover {
    transform: translate(var(--magnet-x, 0px), var(--magnet-y, 0px)) translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.btn--ghost:hover {
    transform: translate(var(--magnet-x, 0px), var(--magnet-y, 0px)) translateY(-2px);
}

/* ---------- Number Pop Animation ---------- */
@keyframes valuePop {
    0%   { transform: scale(1); }
    40%  { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.value-pop {
    animation: valuePop 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-result], [data-breakdown] {
    display: inline-block;
    transform-origin: center;
}

/* ---------- Animated Gradient Hero Title ---------- */
.hero__title-accent {
    background: linear-gradient(90deg, var(--accent), var(--accent), var(--accent));
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientText 4s ease-in-out infinite;
}

@keyframes gradientText {
    0%, 100% { background-position: 0% center; }
    50%      { background-position: 100% center; }
}

/* Light mode: keep solid color for readability */
[data-theme="light"] .hero__title-accent {
    -webkit-text-fill-color: var(--accent);
    background: none;
    animation: none;
}

/* ---------- Glowing Border Travel on Card Hover ---------- */
.card {
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius);
    padding: 1px;
    background: linear-gradient(120deg, transparent 30%, var(--accent-glow) 50%, transparent 70%);
    background-size: 300% 100%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 2;
    animation: borderTravel 3s linear infinite paused;
}

.card:hover::before {
    opacity: 1;
    animation-play-state: running;
}

@keyframes borderTravel {
    0%   { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

/* ---------- Parallax Hero BG ---------- */
.hero__bg {
    transition: transform 0.1s linear;
    will-change: transform;
}

/* ---------- Grand Total Animated Underline ---------- */
.grand-total {
    position: relative;
}

.grand-total::after {
    content: '';
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    background-size: 200% 100%;
    animation: shimmer 3s ease-in-out infinite;
}

/* ---------- Hero Badge Pulse ---------- */
.hero__badge {
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both,
               badgePulse 3s ease-in-out 1s infinite;
}

@keyframes badgePulse {
    0%, 100% { border-color: var(--border-hover); box-shadow: none; }
    50%      { border-color: var(--accent-glow); box-shadow: 0 0 20px var(--accent-dim); }
}

/* ---------- Field Result Number Styling ---------- */
.field__result {
    transition: color 0.2s ease, transform 0.2s ease;
}

/* ---------- Enhanced Marquee Speed on Hover ---------- */
.marquee__track {
    transition: animation-duration 0.4s ease;
}

.marquee:hover .marquee__track {
    animation-duration: 15s;
}

/* ---------- Section Title Gradient Accent ---------- */
.section-header__title {
    background: linear-gradient(135deg, var(--text) 60%, var(--accent) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme="light"] .section-header__title {
    -webkit-text-fill-color: var(--text);
    background: none;
}

/* ---------- How Card Number Badge ---------- */
.how-card__num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--accent-dim);
    color: var(--accent);
    font-size: 0.75rem;
    margin-bottom: 16px;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s ease;
}

.how-card:hover .how-card__num {
    transform: scale(1.15) rotate(8deg);
    background: var(--accent);
    color: var(--accent-text);
}

/* ---------- Results Panel Glow on Update ---------- */
.results-panel {
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                translate 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.results-panel.updating {
    border-color: var(--accent-glow);
    box-shadow: 0 0 40px var(--accent-dim);
}

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

    .reveal {
        opacity: 1;
        transform: none;
    }

    .card {
        transform: none !important;
    }

    .btn {
        transform: none !important;
    }

    .hero__bg {
        transform: none !important;
    }

    .hero__title-accent {
        -webkit-text-fill-color: var(--accent);
        animation: none;
    }

    .card::before,
    .grand-total::after {
        display: none;
    }
}