/* Tierra y Sol - Spanish Word Learning App Design Tokens */
:root {
    --color-primary: #D9483B;
    --color-primary-hover: #BF3A2E;
    --color-primary-light: #FDEEEB;
    --color-secondary: #E0872E;
    --color-secondary-light: #FEF3E7;
    --color-accent: #1E293B;
    --color-success: #16A34A;
    --color-success-light: #ECFDF5;
    --color-warning: #D97706;
    --color-bg: #FAF8F5;
    --color-surface: #FFFFFF;
    --color-surface-subtle: #FDFBF8;
    --color-border: #EBE6DE;
    --color-border-subtle: #F3EFEA;
    --color-text-primary: #1C1917;
    --color-text-secondary: #57534E;
    --color-text-muted: #78716C;
    --shadow-sm: 0 1px 3px rgba(60, 40, 20, 0.04), 0 1px 2px rgba(60, 40, 20, 0.02);
    --shadow-md: 0 4px 16px -2px rgba(60, 40, 20, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.03);
    --shadow-hero: 0 8px 28px -4px rgba(217, 72, 59, 0.08), 0 4px 12px -2px rgba(60, 40, 20, 0.04);
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --radius-full: 9999px;
}

* {
    box-sizing: border-box;
}

html, body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Browser Surfaces: Selection & Custom Scrollbars */
::selection {
    background-color: #FDEEEB;
    color: #BF3A2E;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: #DFD7CC;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #C4BCB1;
}

/* Tabular Numerals for metrics, counters, and scores */
.tabular-numbers, .metric-value, .kbd-pill, .stat-value {
    font-variant-numeric: tabular-nums;
}

/* Warm Elegant App Loader */
.app-loader {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, #FAF8F5 0%, #F5F0E8 100%);
    padding: 24px;
}

.loader-content {
    text-align: center;
    max-width: 360px;
    animation: fadeIn 0.4s ease-out;
}

.loader-logo {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, #D9483B 0%, #E0872E 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(217, 72, 59, 0.2);
}

.logo-accent {
    color: #FFFFFF;
    font-size: 36px;
    font-weight: 800;
    line-height: 1;
    font-family: 'Outfit', sans-serif;
}

.loader-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 6px;
    letter-spacing: -0.02em;
}

.loader-subtitle {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0 0 20px;
    font-weight: 400;
}

.loader-bar {
    width: 180px;
    height: 4px;
    background: #EBE6DE;
    border-radius: 4px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.loader-progress {
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    border-radius: 4px;
    animation: pulseOpacity 1.6s ease-in-out infinite;
}

@keyframes pulseOpacity {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

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

/* Card Hierarchy */
.tierra-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.tierra-card:hover {
    box-shadow: var(--shadow-md);
    border-color: #DFD7CC;
}

/* Hero / Anchor Card: Leads visual priority on the screen */
.tierra-hero-card {
    background: linear-gradient(135deg, #FFFFFF 0%, #FDFBF8 100%);
    border: 1px solid #E5DFD4;
    border-radius: 20px;
    box-shadow: var(--shadow-hero);
    position: relative;
    overflow: hidden;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.tierra-hero-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #D9483B 0%, #E0872E 100%);
}

/* Supporting / Secondary Action Card */
.tierra-card-subtle {
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.tierra-card-subtle:hover {
    border-color: #D9483B;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}



/* Refined Literary Example Callout (Replaces nested cards) */
.literary-example {
    border-left: 3px solid #E0872E;
    padding-left: 16px;
    margin-top: 14px;
    text-align: left;
    width: 100%;
}

.literary-example-quote {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    font-style: italic;
    line-height: 1.5;
}

.literary-example-translation {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 4px;
    line-height: 1.4;
}

/* Spanish Audio Button */
.audio-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-primary-light);
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
    transition: transform 0.15s ease, background-color 0.15s ease;
}

.audio-btn:hover {
    background: #FBDDD7;
    transform: scale(1.08);
}

.audio-btn:active {
    transform: scale(0.95);
}

.audio-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Keyboard Shortcut Pills */
.kbd-pill {
    background: #F3EFEA;
    border: 1px solid #DFD8CD;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 6px;
    box-shadow: 0 1px 0 rgba(0,0,0,0.06);
    font-family: inherit;
    display: inline-block;
}

/* ==========================================================================
   Quiz Card Fade Transitions
   ========================================================================== */
@keyframes quizFadeOut {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-8px) scale(0.985);
    }
}

@keyframes quizFadeIn {
    0% {
        opacity: 0;
        transform: translateY(8px) scale(0.985);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.quiz-card-stage {
    width: 100%;
    will-change: opacity, transform;
}

.quiz-card-stage.fade-out {
    animation: quizFadeOut 0.12s cubic-bezier(0.4, 0, 1, 1) forwards;
}

.quiz-card-stage.fade-in {
    animation: quizFadeIn 0.15s cubic-bezier(0, 0, 0.2, 1) forwards;
}

@media (prefers-reduced-motion: reduce) {
    .quiz-card-stage.fade-out {
        animation: none !important;
        opacity: 0;
    }
    .quiz-card-stage.fade-in {
        animation: none !important;
        opacity: 1;
    }
}

/* Layout & Header Chrome Tokens */
.app-header {
    background: #FFFFFF !important;
    border-bottom: 1px solid var(--color-border) !important;
    height: 64px;
}

.app-main-content {
    padding-top: 76px;
    padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
}

.app-page-container {
    padding-top: 12px;
    padding-bottom: 24px;
}

/* Quiz Option Buttons & Compass Grid */
.quiz-compass-layout {
    width: 100%;
    margin: 0 auto;
}

.quiz-active-viewport {
    width: 100%;
    display: flex;
    flex-direction: column;
}

.quiz-compass-grid {
    display: grid;
    grid-template-columns: 1fr 1.35fr 1fr;
    grid-template-rows: auto auto auto;
    grid-template-areas:
        ".      top     ."
        "left   center  right"
        ".      bottom  .";
    gap: 16px;
    align-items: stretch;
}

.quiz-compass-center {
    grid-area: center;
    background: #FAF8F5;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 180px;
    box-shadow: inset 0 1px 3px rgba(60, 40, 20, 0.03);
}

.quiz-prompt-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: #78716C;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 4px;
}

.quiz-target-word {
    font-size: clamp(1.6rem, 5.5vw, 2.25rem);
    font-weight: 800;
    color: #1C1917;
    letter-spacing: -0.02em;
    line-height: 1.15;
    word-break: break-word;
}

.quiz-pos-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: #E0872E;
    font-style: italic;
    display: block;
    margin-top: 2px;
}

.quiz-audio-btn {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.quiz-compass-btn {
    border-radius: var(--radius-md) !important;
    text-transform: none !important;
    font-weight: 600 !important;
    font-size: 1.05rem !important;
    letter-spacing: 0 !important;
    border: 1.5px solid var(--color-border) !important;
    transition: all 0.18s ease !important;
    background: var(--color-surface) !important;
    color: var(--color-text-primary) !important;
    cursor: pointer;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    text-align: left;
    width: 100%;
    touch-action: manipulation !important;
    -webkit-tap-highlight-color: transparent !important;
}

.quiz-compass-btn-top {
    grid-area: top;
}

.quiz-compass-btn-bottom {
    grid-area: bottom;
}

.quiz-compass-btn-left {
    grid-area: left;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    gap: 10px;
    padding: 20px 14px;
}

.quiz-compass-btn-right {
    grid-area: right;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    gap: 10px;
    padding: 20px 14px;
}

.quiz-option-text {
    font-weight: 600;
    font-size: 1.02rem;
    line-height: 1.3;
}

.quiz-compass-btn:hover:not([disabled]) {
    border-color: var(--color-primary) !important;
    background: var(--color-primary-light) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.quiz-compass-btn:focus-visible {
    outline: 2px solid var(--color-primary) !important;
    outline-offset: 2px;
}

/* Arrow Key Badge */
.kbd-pill-arrow {
    background: #F3EFEA;
    border: 1px solid #DFD8CD;
    color: var(--color-text-secondary);
    font-size: 1.15rem;
    font-weight: 800;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    box-shadow: 0 1px 0 rgba(0,0,0,0.06);
    flex-shrink: 0;
    line-height: 1;
}

/* Responsive adaptation for mobile viewports: Guaranteed 1-Screen Fit */
@media (max-width: 640px) {
    /* App Chrome Compactification */
    .app-header {
        height: 52px !important;
    }

    .app-main-content {
        padding-top: 56px !important;
        padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px)) !important;
    }

    .app-page-container {
        padding-top: 4px !important;
        padding-bottom: 4px !important;
        padding-left: 10px !important;
        padding-right: 10px !important;
    }

    /* Mobile Bottom Navigation Bar */
    .mobile-bottom-nav {
        height: calc(50px + env(safe-area-inset-bottom, 0px)) !important;
    }

    .mobile-nav-item {
        padding: 4px 2px !important;
        gap: 2px !important;
    }

    .mobile-nav-item span {
        font-size: 0.7rem !important;
    }

    /* Quiz Setup on Mobile */
    .quiz-setup-header {
        margin-bottom: 8px !important;
        padding-top: 0 !important;
    }

    .quiz-setup-card {
        padding: 14px 12px !important;
        margin-bottom: 8px !important;
        border-radius: var(--radius-md) !important;
    }

    /* Quiz Active 1-Screen Viewport */
    .quiz-active-viewport {
        max-height: calc(100dvh - 116px);
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        overflow: hidden;
    }

    .quiz-active-header {
        margin-bottom: 3px !important;
    }

    .quiz-progress {
        height: 4px !important;
        margin-bottom: 6px !important;
    }

    .quiz-card-stage {
        margin-bottom: 0 !important;
    }

    .quiz-question-paper {
        padding: 10px 12px !important;
        margin-bottom: 0 !important;
        border-radius: var(--radius-md) !important;
    }

    .quiz-compass-grid {
        display: flex !important;
        flex-direction: column !important;
        gap: 6px !important;
    }

    .quiz-compass-center {
        order: -1;
        min-height: auto !important;
        padding: 8px 10px !important;
        border-radius: 10px !important;
        margin-bottom: 2px !important;
        border: 1px solid var(--color-border) !important;
        box-shadow: none !important;
    }

    .quiz-prompt-label {
        font-size: 0.68rem !important;
        letter-spacing: 0.04em !important;
        margin-bottom: 1px !important;
    }

    .quiz-target-word {
        font-size: clamp(1.35rem, 5.2vw, 1.7rem) !important;
        line-height: 1.15 !important;
        margin: 1px 0 !important;
    }

    .quiz-audio-btn {
        width: 28px !important;
        height: 28px !important;
    }

    .quiz-audio-btn svg {
        font-size: 16px !important;
    }

    .quiz-pos-label {
        font-size: 0.72rem !important;
        margin-top: 0 !important;
    }

    .quiz-compass-btn,
    .quiz-compass-btn-top,
    .quiz-compass-btn-left,
    .quiz-compass-btn-right,
    .quiz-compass-btn-bottom {
        width: 100% !important;
        min-height: 44px !important;
        height: auto !important;
        padding: 6px 10px !important;
        flex-direction: row !important;
        justify-content: space-between !important;
        align-items: center !important;
        text-align: left !important;
        gap: 8px !important;
        border-radius: 10px !important;
    }

    .quiz-option-text {
        font-size: 0.92rem !important;
        line-height: 1.25 !important;
    }

    .kbd-pill-arrow {
        width: 24px !important;
        height: 24px !important;
        font-size: 0.85rem !important;
        border-radius: 6px !important;
    }

    .quiz-result-icon {
        font-size: 18px !important;
    }

    /* Quiz Celebration / Results on Mobile */
    .quiz-celebration-card {
        padding: 16px 12px !important;
        margin-bottom: 8px !important;
    }

    .quiz-celebration-icon {
        width: 48px !important;
        height: 48px !important;
        margin-bottom: 8px !important;
    }

    .quiz-celebration-icon svg {
        font-size: 26px !important;
    }

    .quiz-score-display {
        font-size: clamp(2rem, 6.5vw, 2.6rem) !important;
    }

    .quiz-missed-list {
        max-height: 140px !important;
    }
}

/* Mobile Bottom Navigation Bar */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-top: 1px solid var(--color-border);
    height: calc(58px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    z-index: 1000;
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.04);
    display: flex;
    align-items: stretch;
    justify-content: space-around;
    width: 100%;
}

.mobile-nav-item {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: #78716C;
    padding: 6px 2px;
    gap: 3px;
    transition: color 0.15s ease, transform 0.15s ease;
    -webkit-tap-highlight-color: transparent;
}

.mobile-nav-item span {
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
}

.mobile-nav-item.active {
    color: var(--color-primary);
}

.mobile-nav-item:active {
    transform: scale(0.92);
}

/* Responsive Table Wrapper */
.responsive-table-scroll {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Mobile Grid Metric Dividers */
.metric-divider-left {
    border-left: 1px solid #F3EFEA;
}

@media (max-width: 599.98px) {
    .metric-divider-mobile-top {
        border-top: 1px solid #F3EFEA;
    }
    .metric-divider-sm-left {
        border-top: 1px solid #F3EFEA;
        border-left: none;
    }
}

@media (min-width: 600px) {
    .metric-divider-sm-left {
        border-left: 1px solid #F3EFEA;
    }
}

/* Section Header Rhythm */
.section-header {
    margin-bottom: 12px;
}

.section-header-title {
    font-weight: 700;
    color: var(--color-text-primary);
    font-size: 1.15rem;
    letter-spacing: -0.01em;
}

.section-header-sub {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* Tabular Numbers */
.tabular-numbers {
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum";
}

/* Tierra Hero Card */
.tierra-hero-card {
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all 0.25s ease;
}

/* Literary Example Sentences */
.literary-example {
    background: #FAF8F5;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-top: 12px;
    text-align: left;
    width: 100%;
}

.literary-example-quote {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    font-style: italic;
    line-height: 1.5;
}

.literary-example-translation {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 4px;
    line-height: 1.4;
}

/* Blazor Error Banner */
#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 14px 20px;
    background: #1C1917;
    color: #FAF8F5;
    font-size: 14px;
    text-align: center;
    z-index: 99999;
    box-shadow: 0 -4px 15px rgba(0,0,0,0.15);
}

#blazor-error-ui .reload {
    color: #F87171;
    font-weight: 600;
    text-decoration: underline;
    margin-left: 12px;
    cursor: pointer;
}

#blazor-error-ui .dismiss {
    color: #9CA3AF;
    margin-left: 16px;
    cursor: pointer;
}