/* =========================================================
   YDSQuiz — "Optik Form" Design System
   Paper, ink, exam-green and a highlighter swipe.
   Type: Poppins
   ========================================================= */

:root {
    /* Palette */
    --color-paper: #f4f6f1;
    --color-surface: #ffffff;
    --color-surface-alt: #f7f9f4;
    --color-ink: #1f2733;
    --color-ink-muted: #5c6672;
    --color-line: #dde3da;
    --color-dot: #dce2d8;

    --color-green: #2e8b4f;
    --color-green-dark: #21693b;
    --color-green-bg: #e4f2e8;

    --color-marker: #ffd43b;
    --color-hl: rgba(255, 212, 59, 0.55);
    --color-hl-soft: rgba(255, 212, 59, 0.3);

    --color-red: #d5453c;
    --color-red-dark: #b03228;
    --color-red-bg: #fbeae8;

    /* Aliases kept for existing class hooks */
    --color-bg: var(--color-paper);
    --color-text: var(--color-ink);
    --color-text-muted: var(--color-ink-muted);
    --color-border: var(--color-line);
    --color-primary: var(--color-green);
    --color-primary-dark: var(--color-green-dark);
    --color-primary-bg: var(--color-green-bg);
    --color-accent: var(--color-green-dark);
    --color-danger: var(--color-red);
    --color-danger-bg: var(--color-red-bg);

    /* Type */
    --font-display: 'Poppins', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-sans: 'Poppins', system-ui, -apple-system, 'Segoe UI', sans-serif;

    /* Shape & depth */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-pill: 999px;

    --shadow-sm: 0 1px 2px rgba(31, 39, 51, 0.06);
    --shadow-md: 0 4px 16px rgba(31, 39, 51, 0.08);
    --shadow-lg: 0 12px 32px rgba(31, 39, 51, 0.12);

    --header-height: 64px;

    /* Motion */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --duration-fast: 0.15s;
    --duration-base: 0.22s;
    --transition: var(--duration-base) var(--ease-out);
}

[data-theme="dark"] {
    --color-paper: #141a24;
    --color-surface: #1d2530;
    --color-surface-alt: #242e3b;
    --color-ink: #ecf0f5;
    --color-ink-muted: #9aa5b3;
    --color-line: #36404e;
    --color-dot: #1e2632;

    --color-green: #45b36b;
    --color-green-dark: #6fcb8f;
    --color-green-bg: #1e3a2a;

    --color-hl: rgba(255, 212, 59, 0.18);
    --color-hl-soft: rgba(255, 212, 59, 0.12);

    --color-red: #e96a60;
    --color-red-dark: #f1948c;
    --color-red-bg: #3d2421;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    margin: 0;
    min-height: 100vh;
    background-color: var(--color-paper);
    background-image: radial-gradient(var(--color-dot) 1px, transparent 1px);
    background-size: 22px 22px;
    color: var(--color-ink);
    transition: background-color var(--transition), color var(--transition);
    display: flex;
    flex-direction: column;
}

main,
.page-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

a {
    color: var(--color-green-dark);
}

img {
    max-width: 100%;
}

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.01em;
}

:focus-visible {
    outline: 2px solid var(--color-green);
    outline-offset: 2px;
}

/* Marker swipe — the signature highlight */
.hl {
    background: var(--color-hl);
    border-radius: 4px 10px 6px 12px / 10px 5px 12px 6px;
    padding: 0 0.12em;
}

/* =========================================================
   Site header / nav
   ========================================================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
}

.site-header__inner {
    max-width: 1100px;
    margin: 0 auto;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 1.25rem;
}

.logo {
    display: flex;
    align-items: center;
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--color-ink);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.logo em {
    font-style: italic;
    color: var(--color-ink);
    background: var(--color-hl);
    border-radius: 4px 10px 6px 12px / 10px 5px 12px 6px;
    padding: 0 0.14em;
    margin-left: 0.05em;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.site-nav a {
    color: var(--color-ink-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-md);
    transition: background-color var(--transition), color var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--color-green-dark);
    background: var(--color-green-bg);
}

.theme-toggle {
    border: 1px solid var(--color-line);
    background: var(--color-surface-alt);
    color: var(--color-ink);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-pill);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition), transform var(--transition);
    flex-shrink: 0;
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

.theme-toggle:hover {
    background: var(--color-line);
}

.theme-toggle:active {
    transform: scale(0.92);
}

/* =========================================================
   Site footer
   ========================================================= */

.site-footer {
    text-align: center;
    padding: 1.5rem 1rem 2rem;
    color: var(--color-ink-muted);
    font-size: 0.875rem;
}

.site-footer a {
    color: var(--color-ink-muted);
    text-decoration: underline;
}

/* =========================================================
   Cards / containers
   ========================================================= */

.centered {
    text-align: center;
}

#start-container,
#question-container,
#result-container {
    background: var(--color-surface);
    padding: 2.25rem 2rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    width: 92%;
    margin: 1.5rem auto;
    transition: background-color var(--transition);
}

#start-container h1 {
    font-size: clamp(1.9rem, 5vw, 2.4rem);
    margin: 0 0 0.5rem;
}

#start-container .lead {
    color: var(--color-ink-muted);
    font-size: 1.05rem;
    line-height: 1.65;
}

.badge-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin: 1.25rem 0 1.5rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-line);
    color: var(--color-ink-muted);
    padding: 0.35rem 0.8rem;
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 600;
}

.badge::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-green);
    flex-shrink: 0;
}

.start-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

#question {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
    line-height: 1.45;
}

#question b {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 600;
    font-size: 1.15em;
    color: var(--color-ink);
    padding: 0 0.12em;
    background-image: linear-gradient(var(--color-hl), var(--color-hl));
    background-repeat: no-repeat;
    background-size: 100% 58%;
    background-position: 0 72%;
    border-radius: 2px;
    animation: marker-swipe 0.45s var(--ease-out) both;
}

[data-theme="dark"] #question b {
    color: #ffd96b;
}

@keyframes marker-swipe {
    from { background-size: 0% 58%; }
    to { background-size: 100% 58%; }
}

/* =========================================================
   Buttons
   ========================================================= */

.btn-container {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.btn {
    background-color: var(--color-green);
    color: #fff;
    border: none;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    text-align: center;
    text-decoration: none;
    transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

[data-theme="dark"] .btn {
    color: #10261a;
}

.btn:hover {
    background-color: var(--color-green-dark);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0) scale(0.99);
}

.hide {
    display: none !important;
}

/* =========================================================
   Answer options — optic form rows (signature element)
   ========================================================= */

label.btn,
[data-theme="dark"] label.btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    text-align: left;
    background: var(--color-surface);
    color: var(--color-ink);
    border: 1.5px solid var(--color-line);
    padding: 0.8rem 1rem;
    position: relative;
}

label.btn:hover {
    background: var(--color-surface-alt);
    border-color: var(--color-green);
    transform: none;
    box-shadow: none;
}

label.btn:focus-within {
    outline: 2px solid var(--color-green);
    outline-offset: 2px;
}

label.btn input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
    margin: 0;
}

.opt-bubble {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1.5px solid var(--color-ink-muted);
    color: var(--color-ink-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
    transition: background-color var(--duration-fast) var(--ease-out),
                border-color var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out);
}

label.btn:hover .opt-bubble {
    border-color: var(--color-green);
    color: var(--color-green-dark);
}

.opt-text {
    flex: 1;
}

/* Feedback states — the bubble gets "pencilled in" */

label.btn.locked {
    cursor: default;
}

label.btn.locked:hover {
    border-color: var(--color-line);
    background: var(--color-surface);
}

label.btn.reveal-correct {
    background-color: var(--color-green-bg);
    border-color: var(--color-green);
    animation: pop 0.25s var(--ease-out);
}

label.btn.reveal-correct:hover {
    background-color: var(--color-green-bg);
    border-color: var(--color-green);
}

label.btn.reveal-correct .opt-bubble {
    background: var(--color-green);
    border-color: var(--color-green);
    color: #fff;
}

[data-theme="dark"] label.btn.reveal-correct .opt-bubble {
    color: #10261a;
}

label.btn.reveal-wrong {
    background-color: var(--color-red-bg);
    border-color: var(--color-red);
    animation: shake 0.3s ease;
}

label.btn.reveal-wrong:hover {
    background-color: var(--color-red-bg);
    border-color: var(--color-red);
}

label.btn.reveal-wrong .opt-bubble {
    background: var(--color-red);
    border-color: var(--color-red);
    color: #fff;
}

/* Correct answer revealed after a wrong pick */
label.btn.show-correct {
    border-color: var(--color-green);
    border-style: dashed;
}

label.btn.show-correct:hover {
    border-color: var(--color-green);
    background: var(--color-surface);
}

label.btn.show-correct .opt-bubble {
    border-color: var(--color-green);
    color: var(--color-green-dark);
}

label.btn.locked:not(.reveal-correct):not(.reveal-wrong):not(.show-correct) {
    opacity: 0.45;
}

@keyframes pop {
    0% { transform: scale(1); }
    40% { transform: scale(1.015); }
    100% { transform: scale(1); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

/* =========================================================
   Answer review (results)
   ========================================================= */

.answer-item {
    margin: 1rem 0;
    padding: 1rem;
    border-radius: var(--radius-md);
    text-align: left;
}

.answer-item p {
    margin: 0.3rem 0;
}

.answer-item.correct {
    background-color: var(--color-green-bg);
    border-left: 4px solid var(--color-green);
}

.answer-item.wrong {
    background-color: var(--color-red-bg);
    border-left: 4px solid var(--color-red);
}

.answer-item strong {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.1em;
}

.answer-item a {
    color: var(--color-green-dark);
    text-decoration: none;
    font-weight: 600;
}

.answer-item a:hover {
    text-decoration: underline;
}

/* =========================================================
   Question counter (floating)
   ========================================================= */

.question-count {
    position: fixed;
    bottom: 1.25rem;
    left: 1.25rem;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 90;
    background-color: var(--color-surface);
    border: 1px solid var(--color-line);
    color: var(--color-ink-muted);
    padding: 0.45rem 0.9rem;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-sm);
    font-variant-numeric: tabular-nums;
}

/* =========================================================
   Progress bar
   ========================================================= */

#progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--color-line);
    border-radius: var(--radius-pill);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    width: 0;
    background: var(--color-green);
    border-radius: var(--radius-pill);
    transition: width 0.3s var(--ease-out);
}

/* =========================================================
   Results
   ========================================================= */

.score-circle {
    width: 104px;
    height: 104px;
    margin: 0.5rem auto 1rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: var(--color-surface);
    border: 3px solid var(--color-green);
    box-shadow: 0 0 0 6px var(--color-green-bg);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--color-ink);
    font-variant-numeric: tabular-nums;
}

.score-circle small {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--color-ink-muted);
}

.score-message {
    font-size: 1.15rem;
    font-weight: 700;
    margin-top: 0.25rem;
}

.review-title {
    margin-top: 1.5rem;
    text-align: left;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
}

.all-correct {
    font-size: 1.05rem;
    color: var(--color-green-dark);
    background-color: var(--color-green-bg);
    padding: 1rem;
    border-radius: var(--radius-md);
    text-align: center;
}

/* =========================================================
   Secondary / outline buttons
   ========================================================= */

.btn-secondary {
    background-color: transparent;
    color: var(--color-green-dark);
    border: 1.5px solid var(--color-green);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

[data-theme="dark"] .btn-secondary {
    color: var(--color-green-dark);
}

.btn-secondary:hover {
    background-color: var(--color-green-bg);
    transform: none;
    box-shadow: none;
}

#start-container .btn,
#result-container .btn {
    display: inline-block;
    text-align: center;
}

/* =========================================================
   Word bank
   ========================================================= */

.bank-page {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 3rem;
}

.bank-hero {
    text-align: center;
    margin-bottom: 1.5rem;
}

.bank-hero h1 {
    font-size: clamp(1.9rem, 5vw, 2.4rem);
    margin: 0 0 0.35rem;
}

.bank-hero .sub {
    color: var(--color-ink-muted);
    margin-top: 0;
}

.bank-search {
    display: flex;
    gap: 0.5rem;
    max-width: 480px;
    margin: 1.25rem auto 0.5rem;
}

.bank-search input {
    flex: 1;
    padding: 0.7rem 1.1rem;
    border-radius: var(--radius-pill);
    border: 1.5px solid var(--color-line);
    background: var(--color-surface);
    color: var(--color-ink);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.bank-search input::placeholder {
    color: var(--color-ink-muted);
}

.bank-search input:focus {
    border-color: var(--color-green);
    box-shadow: 0 0 0 3px var(--color-green-bg);
}

.bank-count {
    text-align: center;
    color: var(--color-ink-muted);
    font-size: 0.875rem;
    margin: 0.75rem 0 1.25rem;
    font-variant-numeric: tabular-nums;
}

.bank-empty {
    text-align: center;
    color: var(--color-ink-muted);
    padding: 2rem;
    display: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
}

/* Dictionary-entry cards */
.word-card {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: var(--color-surface);
    padding: 14px 16px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.word-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-green);
}

.word-card .w {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 600;
    color: var(--color-ink);
    font-size: 1.15em;
    align-self: flex-start;
    border-radius: 2px;
}

.word-card:hover .w {
    background-image: linear-gradient(var(--color-hl), var(--color-hl));
    background-repeat: no-repeat;
    background-size: 100% 55%;
    background-position: 0 75%;
}

.word-card .m {
    color: var(--color-ink-muted);
    font-size: 0.95em;
}

/* =========================================================
   Word detail page
   ========================================================= */

.word-page {
    max-width: 760px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 3rem;
}

.breadcrumbs {
    font-size: 0.85rem;
    color: var(--color-ink-muted);
    margin-bottom: 1rem;
}

.breadcrumbs a {
    color: var(--color-ink-muted);
    text-decoration: none;
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.word-details {
    background: var(--color-surface);
    padding: 2.25rem 2rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.word-details h1 {
    text-align: center;
    font-style: italic;
    font-size: clamp(2rem, 6vw, 2.6rem);
    margin: 0 0 0.4rem;
}

.word-details h1::after {
    content: "";
    display: block;
    width: 2.2em;
    height: 0.32em;
    margin: 0.18em auto 0;
    background: var(--color-hl);
    border-radius: 4px 10px 6px 12px / 10px 5px 12px 6px;
}

.word-meaning-pill {
    display: block;
    text-align: center;
    color: var(--color-green-dark);
    font-weight: 700;
    font-size: 1.15rem;
    margin-bottom: 1.75rem;
}

.section {
    margin-bottom: 1.5rem;
}

.section-title {
    display: block;
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
    margin-bottom: 0.6rem;
}

.section-content {
    color: var(--color-ink);
    line-height: 1.65;
    margin: 0;
}

.example {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.05rem;
    background-color: var(--color-surface-alt);
    padding: 0.9rem 1.1rem;
    border-left: 4px solid var(--color-marker);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-ink);
}

.word-nav {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.word-nav a {
    flex: 1;
    text-align: center;
    text-decoration: none;
    color: var(--color-ink);
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    padding: 0.65rem 0.75rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background-color var(--transition), border-color var(--transition);
}

.word-nav a:hover {
    background: var(--color-surface-alt);
    border-color: var(--color-green);
}

.word-cta {
    margin-top: 1.75rem;
    text-align: center;
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 768px) {
    .question-count {
        position: static;
        text-align: center;
        margin: 0.5rem auto 1rem;
        width: fit-content;
    }

    #result-container {
        margin-bottom: 3rem;
    }

    .site-header__inner {
        padding: 0 1rem;
    }

    .site-nav a {
        padding: 0.5rem 0.6rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 400px) {
    main,
    .page-main {
        padding: 1rem 0.75rem;
    }

    .site-header__inner {
        gap: 0.5rem;
        padding: 0 0.75rem;
    }

    .site-nav a {
        white-space: nowrap;
        padding: 0.4rem 0.5rem;
        font-size: 0.8rem;
    }

    #start-container,
    #question-container,
    #result-container,
    .word-details {
        padding: 1.5rem 1.15rem;
        width: 100%;
    }

    #question {
        font-size: 1.25rem;
    }

    .logo {
        font-size: 1.25rem;
    }
}

/* =========================================================
   Reduced motion
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}