/* --- CSS Variables (Color Palette) --- */
html {
    overflow-y: scroll;
}

:root {
    --color-primary: #4f6dff;
    --color-primary-light: #2a3b7d;
    --color-primary-dark: #3a5bf0;
    --color-secondary: #ffcd1f; 
    
    --color-bg: #0a092b; 
    --color-bg-secondary: #1a2342; 
    --color-card-bg: #232e54; 
    --color-text-primary: #ffffff; 
    --color-text-secondary: #cbd5e1; /* Slightly brighter for better contrast */
    --color-border: #3a497c;
    
    --color-correct: #38c172;
    --color-correct-bg: rgba(56, 193, 114, 0.15);
    --color-incorrect: #e3342f;
    --color-incorrect-bg: rgba(227, 52, 47, 0.15);

    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.4);
    
    --border-radius-button: 12px;
}

body.light-mode {
    --color-primary: #4257b2;
    --color-primary-light: #f0f3ff;
    --color-primary-dark: #3a4b99;
    --color-secondary: #f2b000;
    
    --color-bg: #f6f7fb;
    --color-bg-secondary: #ffffff;
    --color-card-bg: #ffffff;
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    
    --color-correct: #16a34a;
    --color-incorrect: #dc2626;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    font-family: 'Inter', sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    /* Prevent selection of text globally for study helper */
    user-select: none;
    -webkit-user-select: none;
}

/* Allow selection in editable fields and study content */
input,
textarea,
[contenteditable],
#empty-deck-view h2,
#empty-deck-view p,
#reveal-passage-title,
#reveal-content-area,
#reveal-content-area *,
#type-passage-title,
#type-feedback,
#type-feedback *,
#order-passage-title,
#order-view > p,
#order-list,
#order-list * {
    user-select: text;
    -webkit-user-select: text;
}

/* --- Common UI --- */
.app-view { display: none; animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1); }

@keyframes fadeIn { 
    from { opacity: 0; transform: translateY(15px); } 
    to { opacity: 1; transform: translateY(0); } 
}

@keyframes popIn {
    0% { transform: scale(0.95); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.animate-pop {
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* --- Header Logo --- */
#header-logo {
    /* keep centered in the header (index.html positions it absolute with top classes) */
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    transition: all 0.3s ease;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    display: block;
    margin: 0 auto;
    /* Move the logo down slightly so it sits closer to the site title */
    top: 3.5rem;
}
#header-logo:hover {
    /* No scale/animation on hover to match v2 (keep centered transform and base shadow) */
    transform: translateX(-50%);
    box-shadow: var(--shadow-sm);
}

/* --- Buttons --- */
.nav-button {
    background: transparent;
    color: var(--color-text-secondary);
    font-weight: 700;
    font-size: 1.1rem;
    padding: 1rem 1.5rem;
    border-radius: 0;
    border-bottom: 4px solid transparent;
    transition: all 0.2s ease;
    position: relative;
}
/* Keep hover subtle and non-animated (visual focus handled by active state) */
.nav-button:hover {
    color: var(--color-text-secondary);
    background: transparent;
}

/* Active indicator: a short thicker segment under the active button */
.nav-button.active {
    color: var(--color-primary);
}
.nav-button.active::after {
    content: "";
    position: absolute;
    left: 18%;
    right: 18%;
    bottom: -2px; /* sit on top of the decorative nav line */
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    pointer-events: none;
}
/* Special style for Share button to stand out */
.nav-button.share-button {
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-bottom-width: 1px;
    padding: 0.5rem 1rem;
    margin-left: 0.5rem;
}
.nav-button.share-button:hover {
    background-color: var(--color-primary);
    color: white;
}

.main-action-button {
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius-button);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.main-action-button:hover { 
    background-color: var(--color-primary-dark); 
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.main-action-button:active {
    transform: translateY(0);
}
.main-action-button:disabled {
    background-color: var(--color-border);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
    opacity: 0.7;
}
.main-action-button:disabled:hover {
    background-color: var(--color-border);
    color: var(--color-text-secondary);
    box-shadow: none;
    transform: none;
}

.secondary-action-button {
    background-color: var(--color-card-bg);
    color: var(--color-text-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-button);
    font-weight: 700;
    transition: all 0.2s ease;
}
.secondary-action-button:hover {
    border-color: var(--color-text-secondary);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
}
.secondary-action-button.active {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: rgba(79, 109, 255, 0.1);
}

.danger-action-button {
    background-color: transparent;
    color: var(--color-incorrect);
    border: 1px solid var(--color-incorrect);
    border-radius: var(--border-radius-button);
    transition: all 0.2s ease;
}
.danger-action-button:hover {
    background-color: var(--color-incorrect);
    color: white;
}

.nav-arrow-button {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    color: var(--color-text-primary);
    font-size: 1.25rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.nav-arrow-button:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-secondary);
    color: var(--color-primary);
    transform: scale(1.05);
}

.create-toggle-button {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    color: var(--color-text-secondary);
    background: transparent;
    border: 1px solid transparent;
    transition: all 0.2s;
}
.create-toggle-button.active {
    background-color: var(--color-card-bg);
    color: var(--color-primary);
    border-color: var(--color-border);
    font-weight: 700;
    box-shadow: var(--shadow-sm);
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
}
.footer-link {
    display: inline-block;
    white-space: normal;
    word-break: normal;
    overflow-wrap: normal;
    padding: 0 0.25rem;
    -webkit-text-decoration-skip-ink: auto;
    text-decoration-skip-ink: auto;
    text-underline-offset: 3px;
}
#about-button,
#keybinds-button,
button.footer-link {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    font: inherit;
    background: none;
    border: none;
    cursor: pointer;
    color: inherit;
    font-weight: inherit;
    transition: color 0.12s ease;
    display: inline-block;
    margin: 0;
    padding: 0 0.25rem;
    vertical-align: baseline;
}

/* Make footer links underlined with no hover transition (instant change only) */
footer .footer-link {
    text-decoration: underline;
    transition: none !important;
}
footer #about-button,
footer #keybinds-button,
footer button.footer-link {
    transition: none !important;
}
/* Keep hover color immediate (no animation). If you prefer no color change at all, set color: inherit; */
footer .footer-link:hover {
    /* Do not change color on hover (override inline Tailwind hover utilities) */
    color: inherit !important;
}

/* --- Create Mode --- */
.passage-editor-row {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-button);
    padding: 1.5rem;
    cursor: grab;
    transition: box-shadow 0.2s, transform 0.2s;
}
.passage-editor-row:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-text-secondary);
}
.passage-editor-row.dragging { 
    opacity: 0.8; 
    border: 2px dashed var(--color-primary); 
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

/* --- Reveal Mode Styles --- */
#reveal-container {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
}

.reveal-line {
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    /* Ensure clean rendering */
    transform-origin: left center;
    backface-visibility: hidden;
    /* Important: Preserves spaces so hints for indentation are visible */
    white-space: pre-wrap;
}

.reveal-line.hidden .reveal-hidden-part {
    /* The "Pristine" Blur Effect */
    filter: blur(8px);
    opacity: 0.3;
    user-select: none;
    -webkit-user-select: none;
    transform: scale(0.99);
    display: inline-block;
}
.reveal-line.hidden:hover {
    opacity: 0.8; /* Hint that it's interactive */
}

.reveal-line.visible {
    opacity: 1;
    cursor: text;
    background-color: transparent;
}
.reveal-line.visible .reveal-hidden-part {
    filter: blur(0);
    opacity: 1;
}

/* --- Type Mode Styles --- */
#type-input-area,
#type-ghost-overlay {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    letter-spacing: normal;
    font-variant-ligatures: none;
    font-feature-settings: "liga" 0;
    tab-size: 4;
}

#type-input-area {
    background: rgba(0,0,0,0.02); /* Very subtle tint */
    color: var(--color-text-primary);
    caret-color: var(--color-primary);
}
#type-ghost-overlay {
    top: 2px;
    right: 2px;
    bottom: 2px;
    left: 2px;
    width: auto;
    height: auto;
    padding: 1.5rem;
    color: var(--color-text-secondary);
    letter-spacing: normal;
}

#type-feedback.bg-green-100 {
    background-color: var(--color-correct-bg);
    color: var(--color-correct);
    border: 1px solid var(--color-correct);
}
#type-feedback.bg-red-100 {
    background-color: var(--color-incorrect-bg);
    color: var(--color-incorrect);
    border: 1px solid var(--color-incorrect);
}
.type-feedback-summary {
    font-weight: 800;
    margin-bottom: 1rem;
}
.type-feedback-content {
    display: grid;
    gap: 1rem;
}
.type-feedback-section {
    display: grid;
    gap: 0.45rem;
}
.type-feedback-label {
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.8;
}
.type-feedback-body {
    white-space: pre-wrap;
    word-break: break-word;
}
.type-feedback-token {
    border-radius: 0.35rem;
    padding: 0.05em 0.18em;
}
.type-feedback-token.correct {
    background-color: var(--color-correct-bg);
    color: var(--color-correct);
}
.type-feedback-token.incorrect {
    background-color: var(--color-incorrect-bg);
    color: var(--color-incorrect);
}
.type-feedback-token.missing {
    background-color: rgba(255, 205, 31, 0.16);
    color: var(--color-secondary);
}
.type-feedback-token.ignored {
    opacity: 0.65;
}
.type-feedback-empty {
    opacity: 0.75;
    font-style: italic;
}

/* --- Order Mode Styles --- */
.order-item {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.25rem;
    cursor: grab;
    transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
    font-weight: 500;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
}
/* Add a handle icon via CSS */
.order-item::before {
    content: "⋮⋮";
    color: var(--color-border);
    font-weight: 900;
    letter-spacing: 2px;
    font-size: 1.2rem;
}

.order-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.order-item.dragging {
    opacity: 0.9;
    background-color: var(--color-bg-secondary);
    border: 2px dashed var(--color-primary);
    box-shadow: var(--shadow-lg);
    cursor: grabbing;
}
.order-item.correct {
    border-color: var(--color-correct);
    background-color: var(--color-correct-bg);
    color: var(--color-correct);
}
.order-item.incorrect {
    border-color: var(--color-incorrect);
    background-color: var(--color-incorrect-bg);
    color: var(--color-incorrect);
}

/* --- Toast --- */
#toast-notification {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}
#toast-notification.show { opacity: 1; transform: translateY(0); }

/* --- Modals --- */
#about-modal-overlay.visible, #keybinds-modal-overlay.visible, #clear-confirm-modal-overlay.visible {
    visibility: visible; 
    opacity: 1;
    pointer-events: auto;
}
#about-modal-overlay.visible #about-modal-content, 
#keybinds-modal-overlay.visible #keybinds-modal-content,
#clear-confirm-modal-overlay.visible #clear-confirm-modal-content {
    transform: scale(1);
}