/* ============================================
   TONLEITER APP - Main Styles
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - New Palette */
    --color-primary: #FF6B6B;
    --color-primary-dark: #E85555;
    --color-primary-light: #FF8E8E;
    --color-secondary: #6C5CE7;
    --color-accent: #FDCB6E;

    /* Semantic colors */
    --color-gt: #00B894;       /* Ganzton - Teal */
    --color-gt-light: #D1F4E8;
    --color-ht: #E17055;       /* Halbton - Coral Red */
    --color-ht-light: #FADDD5;

    --color-success: #00B894;
    --color-error: #E17055;
    --color-warning: #FDCB6E;

    /* Neutrals */
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-text: #212529;
    --color-text-muted: #6c757d;
    --color-border: #dee2e6;

    /* Keyboard colors */
    --key-white: #ffffff;
    --key-white-active: #FFF8E7;
    --key-white-pressed: #FDCB6E;
    --key-black: #2c3e50;
    --key-black-active: #34495e;
    --key-black-pressed: #5d6d7e;
    --key-inactive: #e9ecef;
    --key-active: #FDCB6E;
    --key-glow: rgba(253, 203, 110, 0.4);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* Typography */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-body: 20px;
    --font-size-sm: 14px;
    --font-size-base: 18px;
    --font-size-lg: 22px;
    --font-size-xl: 28px;
    --font-size-xxl: 36px;
    --font-size-display: 44px;

    /* Touch targets */
    --touch-target-min: 44px;

    /* Borders */
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --border-radius-pill: 50px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.1), 0 3px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.15), 0 5px 10px rgba(0,0,0,0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --duration-normal: 250ms;
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background: linear-gradient(135deg, #f5f7fa 0%, #fef5f1 25%, #f8f4ff 50%, #f1f9ff 75%, #f5f7fa 100%);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
    padding: var(--spacing-md);
}

.screen.active {
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3 {
    margin: 0 0 var(--spacing-md);
    line-height: 1.2;
}

h1 {
    font-size: var(--font-size-xxl);
    font-weight: 700;
}

h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

p {
    margin: 0 0 var(--spacing-md);
}

.subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

/* Semantic text */
.ht-text {
    color: var(--color-ht);
}

.gt-text {
    color: var(--color-gt);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-user-select: none;
    user-select: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(255, 107, 107, 0.3);
    border-radius: var(--border-radius);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-surface);
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.15);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
    min-height: 60px;
}

.btn-check {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    box-shadow: 0 4px 14px rgba(255, 107, 107, 0.3);
}

.btn-check:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    transform: translateY(-2px);
}

.btn-back {
    background: transparent;
    color: var(--color-text-muted);
    padding: var(--spacing-sm);
    font-size: var(--font-size-base);
}

.btn-back:hover {
    color: var(--color-text);
}

.btn-play {
    background: linear-gradient(135deg, #26D0A7 0%, var(--color-success) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    box-shadow: 0 4px 14px rgba(0, 184, 148, 0.3);
}

.btn-play:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(0, 184, 148, 0.4);
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.5em;
}

/* Start Screen */
#start-screen {
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
}

.start-container {
    max-width: 500px;
    width: 100%;
    position: relative;
    z-index: 1;
}

.start-container h1 {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: var(--font-size-display);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.header-image {
    width: 100%;
    height: auto;
    margin-bottom: var(--spacing-lg);
}

.start-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* Section Header */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    margin: 0;
    flex: 1;
    text-align: center;
}

.progress-indicator {
    display: flex;
    gap: var(--spacing-xs);
}

.progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-border);
    transition: all var(--ease-spring) var(--duration-normal);
    position: relative;
}

.progress-dot.completed {
    background: linear-gradient(135deg, #26D0A7, var(--color-success));
    box-shadow: 0 0 8px rgba(0, 184, 148, 0.4);
}

.progress-dot.current {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    box-shadow: 0 0 8px rgba(255, 107, 107, 0.4);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.9; }
}

/* Phase display */
.phase {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.phase.hidden {
    display: none;
}

.phase-instruction {
    text-align: center;
    max-width: 600px;
}

.phase-instruction p {
    margin: 0 0 var(--spacing-sm);
    font-size: var(--font-size-body);
}

.phase-actions {
    margin-top: 0;
}

/* Checkbox row for half-steps */
.checkbox-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-top: 0;
}

.ht-checkbox {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.ht-checkbox input[type="checkbox"] {
    width: 36px;
    height: 36px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--color-surface);
    border: 3px solid var(--color-border);
    border-radius: 8px;
    position: relative;
    transition: all var(--ease-spring) var(--duration-normal);
    box-shadow: var(--shadow-sm);
}

.ht-checkbox input[type="checkbox"]:hover {
    border-color: var(--color-ht);
    transform: scale(1.05);
}

.ht-checkbox input[type="checkbox"]:checked {
    background: linear-gradient(135deg, #F08A76, var(--color-ht));
    border-color: var(--color-ht);
    box-shadow: 0 0 0 3px rgba(225, 112, 85, 0.2), 0 4px 12px rgba(225, 112, 85, 0.3);
}

.ht-checkbox input[type="checkbox"]:checked::after {
    content: "✓";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    color: white;
    font-size: 20px;
    font-weight: 700;
    animation: check-pop 0.3s var(--ease-bounce);
}

@keyframes check-pop {
    0% { transform: translate(-50%, -50%) scale(0); }
    50% { transform: translate(-50%, -50%) scale(1.2); }
    100% { transform: translate(-50%, -50%) scale(1); }
}

.ht-checkbox label {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text);
}

/* Adjective buttons */
.adjective-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 600px;
}

.btn-adjective {
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-pill);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--ease-spring) var(--duration-normal);
    box-shadow: var(--shadow-sm);
}

.btn-adjective:hover {
    border-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.2);
}

/* Selected state: thick border + shadow (always visible) */
.btn-adjective.selected {
    border: 3px solid var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15), 0 4px 12px rgba(108, 92, 231, 0.3);
    padding: calc(var(--spacing-sm) - 1px) calc(var(--spacing-lg) - 1px);
}

/* Selected without feedback: blue gradient background */
.btn-adjective.selected:not(.correct):not(.incorrect) {
    background: linear-gradient(135deg, #7C6CEF 0%, var(--color-secondary) 100%);
    color: white;
}

/* Feedback colors (only background) */
.btn-adjective.correct {
    background-color: var(--color-gt-light);
    color: var(--color-gt);
    border-color: var(--color-gt);
}

.btn-adjective.incorrect {
    background-color: var(--color-ht-light);
    color: var(--color-ht);
    border-color: var(--color-ht);
}

/* Selected + feedback: keep thick border, but use feedback background */
.btn-adjective.selected.correct {
    background-color: var(--color-gt-light);
    color: var(--color-gt);
    border-color: var(--color-gt);
    box-shadow: 0 0 0 3px rgba(0, 184, 148, 0.15), 0 4px 12px rgba(0, 184, 148, 0.3);
}

.btn-adjective.selected.incorrect {
    background-color: var(--color-ht-light);
    color: var(--color-ht);
    border-color: var(--color-ht);
    box-shadow: 0 0 0 3px rgba(225, 112, 85, 0.15), 0 4px 12px rgba(225, 112, 85, 0.3);
}

/* Audio player */
.audio-player {
    margin: 0;
}

/* Feedback area */
.feedback-area {
    min-height: 0;
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.feedback-area:empty {
    padding: 0;
}

.feedback-success {
    color: var(--color-success);
    font-weight: 500;
}

.feedback-error {
    color: var(--color-error);
    font-weight: 500;
}

/* Feedback Overlay */
.feedback-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    transition: all var(--ease-spring) var(--duration-normal);
}

.feedback-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.feedback-content {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
    transform: scale(1);
    transition: transform var(--ease-bounce) var(--duration-normal);
    max-width: 400px;
}

.feedback-overlay.hidden .feedback-content {
    transform: scale(0.8);
}

.feedback-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    animation: bounce-in 0.6s var(--ease-bounce);
}

@keyframes bounce-in {
    0% { transform: scale(0); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes title-reminder {
    0%   { transform: scale(1); color: inherit; }
    20%  { transform: scale(1.18); color: var(--color-error); }
    50%  { transform: scale(1.12); color: var(--color-error); }
    100% { transform: scale(1); color: inherit; }
}

.modal-title-remind {
    display: inline-block;
    animation: title-reminder 0.5s ease-out;
}

.feedback-icon.success::before {
    content: "✓";
    color: var(--color-success);
    filter: drop-shadow(0 2px 8px rgba(0, 184, 148, 0.3));
}

.feedback-icon.error::before {
    content: "✗";
    color: var(--color-error);
    filter: drop-shadow(0 2px 8px rgba(225, 112, 85, 0.3));
}

.feedback-message {
    font-size: var(--font-size-lg);
    margin: 0;
    font-weight: 500;
}

/* Confetti Canvas */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 99999;
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    :root {
        --font-size-base: 16px;
        --spacing-lg: 20px;
        --spacing-xl: 28px;
    }

    .start-buttons {
        padding: 0 var(--spacing-md);
    }
}

@media (min-width: 1024px) {
    .screen {
        padding: var(--spacing-xl);
    }

    .start-container {
        max-width: 600px;
    }
}