/* ═══════════════════════════════════════════════════════════
   ROOT VARIABLES
═══════════════════════════════════════════════════════════ */
:root {
    --bg:             #0A0A0F;
    --surface:        #12121A;
    --border:         #1E1E2E;
    --accent:         #7C6EFA;
    --text-primary:   #F0EEF8;
    --text-secondary: #A8A3C0;
    --text-muted:     #5C5875;
    --nav-height:     60px;
    --radius-sm:      8px;
    --radius-md:      12px;
    --radius-lg:      16px;
    --radius-xl:      20px;
}

/* ═══════════════════════════════════════════════════════════
   RESET & BASE — mobile-first
═══════════════════════════════════════════════════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: 'DM Sans', system-ui, Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════════════════════════
   PAGE WRAPPER — centres content on wide screens
═══════════════════════════════════════════════════════════ */
.page-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 16px 48px;
    width: 100%;
}

@media (min-width: 600px) {
    .page-wrapper { padding: 32px 24px 60px; }
}

@media (min-width: 900px) {
    .page-wrapper { padding: 40px 32px 72px; }
}

/* ═══════════════════════════════════════════════════════════
   LOGO — compact on mobile, larger on desktop
═══════════════════════════════════════════════════════════ */
.logo-container {
    text-align: center;
    margin-bottom: 24px;
    padding-top: 8px;
}

.logo-img {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    display: block;
    margin: 0 auto 10px;
    box-shadow: 0 6px 24px rgba(124, 110, 250, 0.25);
}

.logo-tagline {
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

@media (min-width: 600px) {
    .logo-container { margin-bottom: 32px; }
    .logo-img       { width: 96px; height: 96px; border-radius: 22px; }
    .logo-tagline   { font-size: 11px; }
}

@media (min-width: 900px) {
    .logo-img     { width: 120px; height: 120px; border-radius: 24px; }
    .logo-tagline { font-size: 12px; }
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION — hamburger on mobile, pill row on desktop
═══════════════════════════════════════════════════════════ */

/* Mobile: burger button */
.nav-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    width: 100%;
    max-width: 480px;
    justify-content: space-between;
    margin-bottom: 8px;
    transition: border-color 0.2s;
}

.nav-toggle:hover  { border-color: var(--accent); }

.nav-toggle-label  { display: flex; align-items: center; gap: 8px; }

.nav-current-page  {
    color: var(--accent);
    font-size: 14px;
}

.burger-icon {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 20px;
    flex-shrink: 0;
}

.burger-icon span {
    display: block;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: 0.3s;
}

/* Dropdown nav on mobile */
.tabs {
    display: none;
    flex-direction: column;
    gap: 6px;
    width: 100%;
    max-width: 480px;
    margin-bottom: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 8px;
    animation: fadeUp 0.2s ease;
}

.tabs.open { display: flex; }

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    font-weight: 600;
    font-family: inherit;
    font-size: 15px;
    text-decoration: none;
    display: block;
    width: 100%;
    text-align: left;
}

.tab-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent);
    color: #0A0A0F;
}

/* Desktop: always-visible pill row */
@media (min-width: 640px) {
    .nav-toggle { display: none; }

    .tabs {
        display: flex !important;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
        width: auto;
        max-width: 860px;
        margin-bottom: 24px;
        background: transparent;
        border: none;
        padding: 0;
    }

    .tab-btn {
        width: auto;
        padding: 10px 20px;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        background: var(--surface);
        text-align: center;
    }

    .tab-btn:hover {
        background: var(--surface);
        border-color: var(--accent);
        color: var(--text-primary);
    }

    .tab-btn.active {
        background: var(--accent);
        border-color: var(--accent);
        color: #0A0A0F;
    }
}

/* ═══════════════════════════════════════════════════════════
   CONTENT CARD
═══════════════════════════════════════════════════════════ */
.content-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 16px;
    width: 100%;
    max-width: 860px;
}

@media (min-width: 480px)  { .content-card { padding: 24px 20px; } }
@media (min-width: 600px)  { .content-card { padding: 28px 24px; } }
@media (min-width: 900px)  { .content-card { padding: 32px 32px; } }

/* ═══════════════════════════════════════════════════════════
   TYPOGRAPHY
═══════════════════════════════════════════════════════════ */
h1, h2, h3 {
    font-family: Georgia, serif;
    color: var(--accent);
    margin-top: 0;
    line-height: 1.25;
}

h2 {
    font-size: clamp(20px, 5vw, 28px);
    margin-bottom: 12px;
}

h3 {
    font-size: clamp(15px, 3.5vw, 18px);
    margin-bottom: 10px;
    margin-top: 20px;
}

p {
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 10px 0;
    font-size: clamp(14px, 3.5vw, 16px);
}

ul {
    color: var(--text-secondary);
    line-height: 1.75;
    margin: 10px 0;
    padding-left: 18px;
    font-size: clamp(14px, 3.5vw, 16px);
}

li { margin-bottom: 8px; }

.date {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 16px;
}

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 20px 0;
}

/* Inline links — use class="external-link" on any <a> that needs accent styling */
.external-link,
.external-link:visited {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity 0.2s;
}

.external-link:hover {
    opacity: 0.8;
}

/* ═══════════════════════════════════════════════════════════
   CTA BUTTON
═══════════════════════════════════════════════════════════ */
.cta-button {
    display: block;
    background: var(--accent);
    color: #0A0A0F;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 700;
    font-family: inherit;
    font-size: 15px;
    margin: 16px auto 0;
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
    /* Minimum touch target */
    min-height: 48px;
    line-height: 1.2;
    vertical-align: middle;
    text-align: center;
    width: fit-content;
}

.cta-button:hover   { opacity: 0.9; }
.cta-button:active  { opacity: 0.75; }

/* ═══════════════════════════════════════════════════════════
   APP PREVIEW IMAGE
═══════════════════════════════════════════════════════════ */
.app-preview {
    display: flex;
    justify-content: center;
    margin: 20px 0 8px;
}

.splash-img {
    width: clamp(160px, 50vw, 220px);
    height: clamp(160px, 50vw, 220px);
    border-radius: var(--radius-xl);
    box-shadow: 0 8px 32px rgba(124, 110, 250, 0.2);
}

/* ═══════════════════════════════════════════════════════════
   SECTION DIVIDERS & HINTS
═══════════════════════════════════════════════════════════ */
.section-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 28px 0 10px;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.section-divider span {
    color: var(--accent);
    font-family: Georgia, serif;
    font-size: 14px;
    font-weight: 700;
    white-space: nowrap;
}

.section-hint {
    color: var(--text-muted);
    font-size: 13px;
    text-align: center;
    margin: 0 0 16px;
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════
   WORD CARD (FLIP)
═══════════════════════════════════════════════════════════ */
.card-carousel {
    perspective: 1200px;
    margin-bottom: 8px;
}

.word-card {
    width: 100%;
    max-width: 480px;
    /* Taller on small screens so back content fits */
    height: clamp(240px, 60vw, 280px);
    margin: 0 auto;
    cursor: pointer;
    position: relative;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-inner.flipped { transform: rotateY(180deg); }

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid var(--border);
    overflow: hidden;
}

.card-front {
    background: linear-gradient(135deg, #16162A 0%, #1a1a2e 100%);
    align-items: center;
    text-align: center;
    gap: 6px;
}

.card-back {
    background: linear-gradient(135deg, #12121f 0%, #1a1a2e 100%);
    transform: rotateY(180deg);
    justify-content: flex-start;
    gap: 10px;
    overflow-y: auto;
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

.card-badge {
    background: rgba(124, 110, 250, 0.15);
    color: var(--accent);
    border: 1px solid rgba(124, 110, 250, 0.3);
    border-radius: 20px;
    font-size: 10px;
    font-weight: 600;
    padding: 3px 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.card-word {
    font-family: Georgia, serif;
    font-size: clamp(26px, 7vw, 36px);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.card-pronunciation {
    font-size: clamp(13px, 3.5vw, 15px);
    color: var(--accent);
    font-style: italic;
}

.card-pos {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-tap-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 8px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50%       { opacity: 1;   }
}

.card-definition {
    color: var(--text-primary);
    font-size: clamp(13px, 3.5vw, 15px);
    line-height: 1.55;
    font-weight: 500;
}

.card-example {
    background: rgba(124, 110, 250, 0.08);
    border-left: 3px solid var(--accent);
    border-radius: 0 6px 6px 0;
    padding: 8px 12px;
    font-size: clamp(12px, 3vw, 13px);
    color: var(--text-secondary);
    line-height: 1.55;
    font-style: italic;
}

.example-label,
.context-label {
    display: block;
    font-style: normal;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent);
    margin-bottom: 3px;
}

.card-context {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Swipe action buttons */
.card-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 14px;
    animation: fadeUp 0.3s ease;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0);   }
}

.swipe-btn {
    flex: 1;
    padding: 13px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    font-family: inherit;
    font-size: clamp(13px, 3.5vw, 14px);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 48px; /* touch target */
}

.swipe-learn {
    background: rgba(248, 113, 113, 0.1);
    color: #f87171;
    border-color: rgba(248, 113, 113, 0.3);
}
.swipe-learn:hover  { background: rgba(248, 113, 113, 0.2); }

.swipe-know {
    background: rgba(52, 211, 153, 0.1);
    color: #34d399;
    border-color: rgba(52, 211, 153, 0.3);
}
.swipe-know:hover   { background: rgba(52, 211, 153, 0.2); }

.swipe-reaction {
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-top: 10px;
    animation: fadeUp 0.3s ease;
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════
   5-DAY JOURNEY STRIP
═══════════════════════════════════════════════════════════ */
.journey-strip {
    display: flex;
    align-items: flex-start;
    overflow-x: auto;
    /* Snap scrolling on mobile */
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 4px 0 14px;
    margin-bottom: 8px;
    gap: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.journey-day {
    scroll-snap-align: start;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
    min-width: 155px;
    flex-shrink: 0;
    transition: border-color 0.2s;
}

.journey-day:hover          { border-color: var(--accent); }

.journey-day-final {
    border-color: rgba(124, 110, 250, 0.4);
    background: linear-gradient(135deg, #12121A 0%, #16162A 100%);
}

.journey-connector {
    color: var(--text-muted);
    font-size: 16px;
    align-self: center;
    padding: 0 4px;
    flex-shrink: 0;
}

.day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.day-label {
    font-family: Georgia, serif;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
}

.day-streak { font-size: 11px; color: var(--text-muted); }

.day-words {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 8px;
}

.word-pill {
    font-size: 10px;
    font-weight: 600;
    padding: 3px 7px;
    border-radius: 5px;
    display: inline-block;
    width: fit-content;
    line-height: 1.4;
}

.word-pill.known {
    background: rgba(52, 211, 153, 0.12);
    color: #34d399;
    border: 1px solid rgba(52, 211, 153, 0.25);
}

.word-pill.learning {
    background: rgba(251, 191, 36, 0.1);
    color: #fbbf24;
    border: 1px solid rgba(251, 191, 36, 0.25);
}

.day-stat {
    font-size: 10px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    padding-top: 7px;
}

/* ═══════════════════════════════════════════════════════════
   WEEK SUMMARY STATS
═══════════════════════════════════════════════════════════ */
.week-summary {
    background: linear-gradient(135deg, #13132A 0%, #1a1a2e 100%);
    border: 1px solid rgba(124, 110, 250, 0.3);
    border-radius: var(--radius-lg);
    padding: 20px 16px;
    margin: 20px 0 8px;
    text-align: center;
}

@media (min-width: 480px) { .week-summary { padding: 24px; } }

.summary-title {
    font-family: Georgia, serif;
    color: var(--accent);
    font-size: clamp(14px, 4vw, 16px);
    font-weight: 700;
    margin-bottom: 16px;
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

@media (min-width: 480px) {
    .summary-stats {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }
}

.stat-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px 10px;
}

@media (min-width: 480px) {
    .stat-box { padding: 14px 20px; min-width: 80px; }
}

.stat-box-highlight {
    border-color: rgba(124, 110, 250, 0.5);
    background: rgba(124, 110, 250, 0.08);
}

.stat-num {
    font-family: Georgia, serif;
    font-size: clamp(22px, 6vw, 26px);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-lbl {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1.3;
}

.summary-quote {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.65;
    border-top: 1px solid var(--border);
    padding-top: 14px;
}

/* ═══════════════════════════════════════════════════════════
   FEEDBACK FORM
═══════════════════════════════════════════════════════════ */
.form-group { margin-bottom: 16px; }

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.form-input {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 16px; /* Prevents iOS auto-zoom on focus */
    padding: 13px 14px;
    transition: border-color 0.2s;
    outline: none;
    appearance: none;
    /* Minimum touch target */
    min-height: 48px;
}

.form-input:focus       { border-color: var(--accent); }
.form-input::placeholder { color: var(--text-muted); }

.form-textarea {
    resize: vertical;
    min-height: 110px;
}

.form-error {
    color: #f87171;
    font-size: 13px;
    margin-bottom: 10px;
    line-height: 1.4;
}

.feedback-success {
    text-align: center;
    padding: 28px 0;
}

.success-icon {
    width: 52px;
    height: 52px;
    background: var(--accent);
    color: #0A0A0F;
    border-radius: 50%;
    font-size: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
}

/* ═══════════════════════════════════════════════════════════
   COMING SOON — ROADMAP
═══════════════════════════════════════════════════════════ */
.roadmap-phase { margin-bottom: 32px; }

.phase-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 14px;
}

.phase-soon {
    background: rgba(124, 110, 250, 0.15);
    color: var(--accent);
    border: 1px solid rgba(124, 110, 250, 0.3);
}

.phase-horizon {
    background: rgba(52, 211, 153, 0.1);
    color: #34d399;
    border: 1px solid rgba(52, 211, 153, 0.25);
}

.phase-future {
    background: rgba(251, 191, 36, 0.08);
    color: #fbbf24;
    border: 1px solid rgba(251, 191, 36, 0.2);
}

/* Stack single column on mobile, grid on wider */
.roadmap-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media (min-width: 480px) {
    .roadmap-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 720px) {
    .roadmap-grid { grid-template-columns: repeat(3, 1fr); }
}

.roadmap-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 18px 16px;
    transition: border-color 0.2s, transform 0.2s;
}

.roadmap-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.roadmap-icon {
    font-size: 26px;
    margin-bottom: 8px;
    display: block;
}

.roadmap-title {
    font-family: Georgia, serif;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.roadmap-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.55;
    margin: 0;
}

.roadmap-banner {
    background: linear-gradient(135deg, #13132A 0%, #1a1a2e 100%);
    border: 1px solid rgba(124, 110, 250, 0.25);
    border-radius: var(--radius-lg);
    padding: 24px 18px;
    text-align: center;
    margin-top: 8px;
}

.roadmap-banner h3 { margin-bottom: 6px; font-size: clamp(16px, 4vw, 20px); }
.roadmap-banner p  { font-size: 14px; color: var(--text-muted); margin: 0 0 16px; }

/* ═══════════════════════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════════════════════ */
.site-footer {
    width: 100%;
    max-width: 860px;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 10px;
}

.footer-logo img {
    width: 28px;
    height: 28px;
    border-radius: 7px;
}

.footer-logo-name {
    font-family: Georgia, serif;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 16px;
    margin-bottom: 14px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-copy a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-copy a:hover { color: var(--accent); }