/* =========================================================
   Quickie Prep — Global Styles
   Palette:
     Green:  #3DDC84
     Teal:   #0EA5A0
     Dark:   #0A1410
     Card:   #0F1E18
   ========================================================= */

*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

:root {
    /* Brand */
    --color-primary: #3DDC84;
    --color-primary-d: #0EA5A0;
    --color-gradient: linear-gradient(135deg, #3DDC84 0%, #0EA5A0 100%);

    /* Status */
    --color-success: #3DDC84;
    --color-danger: #EF5350;
    --color-warning: #FFB74D;
    --color-neutral: #6B7B75;

    /* Backgrounds */
    --color-bg: #0A1410;
    --color-surface: #0F1E18;
    --color-elevated: #142A22;

    /* Text */
    --color-text: #FFFFFF;
    --color-muted: #B0BEC5;

    /* Borders & effects */
    --color-border: rgba(61, 220, 132, 0.2);
    --accent-glow: rgba(61, 220, 132, 0.15);
    --radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(61, 220, 132, 0.25);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ========== SPLASH SCREEN ========== */
#splash {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    gap: 24px;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#splash.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

#splash .splash-logo {
    width: 110px;
    height: 110px;
    border-radius: 24px;
    box-shadow: var(--shadow-glow);
    animation: splashPulse 1.6s ease-in-out infinite;
}

@keyframes splashPulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 0 20px rgba(61, 220, 132, 0.25);
    }

    50% {
        transform: scale(1.06);
        box-shadow: 0 0 36px rgba(61, 220, 132, 0.5);
    }
}

#splash .splash-name {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#splash .splash-tag {
    color: var(--color-muted);
    font-size: 0.9rem;
}

#splash .splash-dots {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

#splash .splash-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    opacity: 0.4;
    animation: dotBounce 1.2s infinite ease-in-out;
}

#splash .splash-dots span:nth-child(2) {
    animation-delay: 0.15s;
}

#splash .splash-dots span:nth-child(3) {
    animation-delay: 0.3s;
}

@keyframes dotBounce {

    0%,
    80%,
    100% {
        transform: translateY(0);
        opacity: 0.4;
    }

    40% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* ========== BRAND HEADER ========== */
.brand-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    max-width: 1100px;
    margin: 0 auto 20px;
    padding: 14px 20px;
    background: rgba(15, 30, 24, 0.85);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.brand-header-left {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: inherit;
}

.brand-header img {
    height: 42px;
    width: 42px;
    border-radius: 10px;
    box-shadow: var(--shadow-glow);
}

.brand-name {
    font-size: 1.35rem;
    font-weight: 800;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.brand-tagline {
    font-size: 0.78rem;
    color: var(--color-muted);
    margin-top: 2px;
}

.brand-nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.brand-nav a {
    color: var(--color-muted);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.15s ease;
}

.brand-nav a:hover {
    color: var(--color-primary);
    background: var(--accent-glow);
}

/* ========== CONTAINER ========== */
.container {
    max-width: 820px;
    margin: 0 auto;
    background: var(--color-surface);
    padding: 32px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.container-wide {
    max-width: 1100px;
}

/* ========== TYPOGRAPHY ========== */
h1,
h2,
h3 {
    color: var(--color-text);
    margin-bottom: 12px;
}

h1 {
    font-size: 28px;
}

h2 {
    font-size: 22px;
}

h3 {
    font-size: 18px;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    margin: 6px 4px 6px 0;
    background: var(--color-gradient);
    color: #0A1410;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    font-family: inherit;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-glow);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(61, 220, 132, 0.4);
}

.btn:disabled {
    background: #3a4a44;
    color: #6B7B75;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
}

.btn.secondary {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    box-shadow: none;
}

.btn.secondary:hover {
    background: var(--accent-glow);
}

.btn.danger {
    background: var(--color-danger);
    color: #fff;
    box-shadow: none;
}

/* ========== FORM FIELDS ========== */
.field {
    display: block;
    margin-bottom: 16px;
}

.field>span {
    display: block;
    font-size: 0.88rem;
    color: var(--color-muted);
    margin-bottom: 6px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="number"],
.field select,
.field textarea {
    width: 100%;
    padding: 12px 14px;
    background: var(--color-elevated);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.15s ease;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.field input:disabled {
    background: #1a2a24;
    color: var(--color-muted);
    cursor: not-allowed;
}

.field select {
    appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, var(--color-primary) 50%),
        linear-gradient(135deg, var(--color-primary) 50%, transparent 50%);
    background-position:
        calc(100% - 20px) calc(50% + 2px),
        calc(100% - 14px) calc(50% + 2px);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    padding-right: 40px;
}

/* ========== OPTION LABELS (quiz) ========== */
.options-group {
    margin: 16px 0;
}

.option-label {
    display: block;
    padding: 14px 18px;
    margin-bottom: 10px;
    background: var(--color-elevated);
    border: 2px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.15s ease;
    color: var(--color-text);
}

.option-label:hover {
    border-color: var(--color-primary);
    background: var(--accent-glow);
}

.option-label input {
    margin-right: 10px;
    accent-color: var(--color-primary);
}

.option-label.correct {
    border-color: var(--color-success);
    background: rgba(61, 220, 132, 0.18);
}

.option-label.incorrect {
    border-color: var(--color-danger);
    background: rgba(239, 83, 80, 0.15);
}

/* ========== TIMER ========== */
.timer {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    text-align: right;
    margin-bottom: 10px;
    font-variant-numeric: tabular-nums;
}

.timer.warn {
    color: var(--color-warning);
}

.timer.danger {
    color: var(--color-danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* ========== PROGRESS BAR ========== */
.progress-bar {
    height: 8px;
    background: var(--color-elevated);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 20px;
}

.progress-bar>div {
    height: 100%;
    background: var(--color-gradient);
    transition: width 0.3s ease;
    border-radius: 4px;
}

/* ========== EXPLANATION ========== */
.explanation {
    background: rgba(255, 183, 77, 0.1);
    border-left: 4px solid var(--color-warning);
    padding: 12px 16px;
    margin-top: 12px;
    border-radius: 6px;
    color: var(--color-text);
}

/* ========== SCORE BOX ========== */
.score-box {
    text-align: center;
    padding: 30px;
    border-radius: var(--radius);
    background: var(--accent-glow);
    border: 1px solid var(--color-border);
    margin-bottom: 20px;
}

.score-box .big {
    font-size: 48px;
    font-weight: 800;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== UTILITY ========== */
.text-muted {
    color: var(--color-muted);
    font-size: 14px;
}

.text-center {
    text-align: center;
}

hr {
    margin: 30px 0;
    border: none;
    border-top: 1px solid var(--color-border);
}

code {
    background: var(--color-elevated);
    color: var(--color-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: "SF Mono", Menlo, Consolas, monospace;
}

/* ========== STAT BADGES ========== */
.stat-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--accent-glow);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 0.82rem;
    color: var(--color-primary);
    font-weight: 600;
    margin: 4px 4px 4px 0;
}

/* ========== SUBJECT GRID ========== */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px;
    margin-top: 20px;
}

.subject-card {
    display: block;
    background: var(--color-elevated);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 16px;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

.subject-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.subject-card h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.subject-card .count {
    font-size: 0.8rem;
    color: var(--color-primary);
    font-weight: 600;
}

/* ========== WELCOME BACK BANNER ========== */
.welcome-banner {
    background: var(--accent-glow);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.welcome-banner h3 {
    margin-bottom: 4px;
}

.welcome-banner p {
    color: var(--color-muted);
    font-size: 0.9rem;
}

/* ========== HERO ========== */
.hero {
    text-align: center;
    padding: 40px 20px 30px;
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(1.8rem, 5vw, 2.6rem);
    font-weight: 800;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 14px;
}

.hero p {
    font-size: 1.05rem;
    color: var(--color-muted);
    margin-bottom: 26px;
}

/* ========== SECTION ========== */
.section {
    max-width: 1100px;
    margin: 0 auto 40px;
    padding: 0 4px;
}

.section h2 {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.section>p {
    color: var(--color-muted);
    margin-bottom: 18px;
}

/* ========== FOOTER ========== */
.footer {
    max-width: 1100px;
    margin: 60px auto 20px;
    padding: 30px 20px;
    text-align: center;
    color: var(--color-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-border);
}

.footer strong {
    color: var(--color-primary);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 600px) {
    body {
        padding: 12px;
    }

    .container {
        padding: 20px;
    }

    .brand-header {
        padding: 12px 14px;
    }

    .brand-nav a {
        padding: 4px 8px;
        font-size: 0.82rem;
    }

    .brand-name {
        font-size: 1.1rem;
    }

    .brand-tagline {
        font-size: 0.7rem;
    }

    .hero {
        padding: 24px 12px 16px;
    }
}

/* ========== FORM EXTRAS ========== */
.field-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--color-muted);
    margin-top: 4px;
    opacity: 0.8;
}

.form-error {
    background: rgba(239, 83, 80, 0.12);
    border-left: 4px solid var(--color-danger);
    padding: 12px 16px;
    border-radius: 6px;
    color: #FF8A80;
    margin-top: 12px;
    font-size: 0.9rem;
}

.form-success {
    background: rgba(61, 220, 132, 0.12);
    border-left: 4px solid var(--color-success);
    padding: 12px 16px;
    border-radius: 6px;
    color: var(--color-success);
    margin-top: 12px;
    font-size: 0.9rem;
}

/* ========== REVIEW PAGE ========== */
.review-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0 16px;
    padding: 14px 18px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-btn {
    padding: 7px 14px;
    background: var(--color-elevated);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.15s ease;
}

.filter-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.filter-btn.active {
    background: var(--color-gradient);
    color: #0A1410;
    border-color: transparent;
}

.review-count {
    font-size: 0.85rem;
    color: var(--color-muted);
}

.review-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

/* ---------- Review Card ---------- */
.review-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 22px;
    margin-bottom: 16px;
    transition: border-color 0.15s ease;
}

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

.review-header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.review-flag {
    font-size: 0.75rem;
    background: rgba(255, 183, 77, 0.15);
    color: var(--color-warning);
    padding: 3px 8px;
    border-radius: 999px;
    font-weight: 600;
}

.review-status {
    margin-left: auto;
    font-size: 0.82rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 999px;
}

.review-status.status-correct {
    background: rgba(61, 220, 132, 0.15);
    color: var(--color-success);
}

.review-status.status-wrong {
    background: rgba(239, 83, 80, 0.15);
    color: var(--color-danger);
}

.review-status.status-skipped {
    background: rgba(176, 190, 197, 0.15);
    color: var(--color-muted);
}

.review-status.status-unknown {
    background: rgba(255, 183, 77, 0.15);
    color: var(--color-warning);
}

.review-question {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: 16px;
}

.review-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.review-option {
    padding: 10px 14px;
    background: var(--color-elevated);
    border: 2px solid transparent;
    border-radius: 8px;
    font-size: 0.92rem;
    color: var(--color-text);
    line-height: 1.5;
}

.review-option.is-correct {
    border-color: var(--color-success);
    background: rgba(61, 220, 132, 0.1);
}

.review-option.is-wrong {
    border-color: var(--color-danger);
    background: rgba(239, 83, 80, 0.1);
}

.tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    margin-left: 8px;
    background: var(--color-primary);
    color: #0A1410;
    vertical-align: middle;
}

.tag-wrong {
    background: var(--color-danger);
    color: #fff;
}

.tag-correct {
    background: var(--color-success);
    color: #0A1410;
}

/* Responsive */
@media (max-width: 600px) {
    .review-toolbar {
        padding: 12px;
    }

    .filter-btn {
        padding: 6px 10px;
        font-size: 0.78rem;
    }

    .review-card {
        padding: 16px;
    }

    .review-status {
        margin-left: 0;
        order: 10;
        width: 100%;
        text-align: center;
    }
}

/* =========================================================
   Exam Mode Picker (added)
   ========================================================= */
.mode-picker {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin: 12px 0 24px;
}

.mode-card {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px;
    border: 2px solid #e5e5e5;
    border-radius: 10px;
    cursor: pointer;
    transition: border-color .15s, background .15s;
    background: #fff;
}

.mode-card:hover {
    border-color: #3DDC84;
}

.mode-card input[type="radio"] {
    margin-top: 4px;
    accent-color: #3DDC84;
}

.mode-card strong {
    display: block;
    margin-bottom: 2px;
    font-size: 1rem;
}

.mode-card span {
    font-size: 0.85rem;
    color: #666;
}

.mode-card:has(input[type="radio"]:checked) {
    border-color: #3DDC84;
    background: rgba(61, 220, 132, 0.06);
}

.mode-card:has(input[type="radio"]:checked) strong {
    color: #1a9f5c;
}