/* ================================
   Điều Lành - Stress Relief Website
   Calming, Organic Design System
   ================================ */

:root {
    /* Calming Color Palette */
    --color-primary: #ff9a8b;
    --color-secondary: #ffd3a5;
    --color-accent: #fecfef;
    --color-sage: #a8d8b9;
    --color-lavender: #c9b6e4;
    
    /* Neutrals with warmth */
    --color-bg-light: #fffbf7;
    --color-bg-card: rgba(255, 255, 255, 0.85);
    --color-text-primary: #4a3f35;
    --color-text-secondary: #8b7e74;
    --color-text-muted: #b5a99a;
    
    /* Shadows & Effects */
    --shadow-soft: 0 8px 32px rgba(255, 154, 139, 0.1);
    --shadow-medium: 0 12px 48px rgba(255, 154, 139, 0.15);
    --shadow-strong: 0 20px 60px rgba(255, 154, 139, 0.2);
    
    /* Typography Scale */
    --font-display: 'Quicksand', 'Segoe UI', sans-serif;
    --font-body: 'Crimson Pro', Georgia, serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 32px;
    --radius-full: 9999px;
    
    /* Animations */
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ================================
   Reset & Base Styles
   ================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background: var(--color-bg-light);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ================================
   Background Effects
   ================================ */

.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -2;
    background: linear-gradient(135deg, 
        #ff9a8b 0%, 
        #ffd3a5 25%,
        #fecfef 50%,
        #a8d8b9 75%,
        #c9b6e4 100%
    );
    background-size: 400% 400%;
    animation: gradientShift 30s ease infinite;
    opacity: 0.3;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.bg-texture {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255, 207, 239, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(168, 216, 185, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 211, 165, 0.1) 0%, transparent 50%);
    backdrop-filter: blur(100px);
}

/* ================================
   Container & Layout
   ================================ */

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================================
   Header
   ================================ */

.header {
    padding: var(--spacing-md) 0;
    animation: slideDown 0.6s ease;
}

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.logo svg {
    color: var(--color-primary);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* ================================
   Main Content
   ================================ */

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg) 0;
}

/* ================================
   Welcome State
   ================================ */

.welcome-state {
    text-align: center;
    animation: fadeInScale 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-line {
    display: block;
    animation: slideUp 0.8s ease backwards;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.subtitle {
    font-size: clamp(1.1rem, 3vw, 1.3rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
    animation: fadeIn 0.8s ease 0.4s backwards;
}

.instruction {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-muted);
    font-size: 0.95rem;
    animation: fadeIn 0.8s ease 0.6s backwards;
}

.instruction svg {
    animation: swipe 2s ease-in-out infinite;
}

@keyframes swipe {
    0%, 100% { transform: translateX(-5px); opacity: 0.3; }
    50% { transform: translateX(5px); opacity: 0.7; }
}

.start-button {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-medium);
    transition: var(--transition-bounce);
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.start-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-strong);
}

.start-button:active {
    transform: translateY(0) scale(0.98);
}

/* ================================
   Scratch Container
   ================================ */

.scratch-container {
    width: 100%;
    max-width: 500px;
    animation: fadeInScale 0.6s ease;
}

.scratch-card {
    position: relative;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    aspect-ratio: 4 / 5;
    backdrop-filter: blur(10px);
}

#scratchCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: grab;
    touch-action: none;
    z-index: 2;
}

#scratchCanvas:active {
    cursor: grabbing;
}

.revealed-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    z-index: 1;
}

/* ================================
   Content Loader
   ================================ */

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

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 154, 139, 0.2);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ================================
   Revealed Content Styles
   ================================ */

.quote-content {
    text-align: center;
    animation: revealContent 0.6s ease;
}

@keyframes revealContent {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.quote-text {
    font-family: var(--font-body);
    font-size: clamp(1.3rem, 4vw, 1.8rem);
    line-height: 1.6;
    color: var(--color-text-primary);
    font-style: italic;
    margin-bottom: var(--spacing-md);
}

.quote-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.3;
}

.image-content img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
    animation: revealContent 0.6s ease;
}

.voucher-content {
    text-align: center;
    animation: revealContent 0.6s ease;
}

.voucher-badge {
    display: inline-block;
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #8b4513;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    animation: shimmer 2s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.2); }
}

.voucher-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.voucher-code {
    background: var(--color-bg-card);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 2px dashed var(--color-primary);
    font-family: monospace;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-md) 0;
    letter-spacing: 2px;
}

.voucher-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-top: var(--spacing-sm);
}

/* ================================
   Action Buttons
   ================================ */

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.btn {
    flex: 1;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transition: var(--transition-smooth);
}

.btn-secondary {
    background: white;
    color: var(--color-text-primary);
    box-shadow: var(--shadow-soft);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary:active {
    transform: translateY(0);
}

/* ================================
   Footer
   ================================ */

.footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
    text-align: center;
    animation: fadeIn 1s ease 0.8s backwards;
}

.footer-advice {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.donate-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: white;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    margin-bottom: var(--spacing-md);
}

.donate-button:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.copyright {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ================================
   Modal
   ================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(74, 63, 53, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-strong);
    position: relative;
    animation: modalSlideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-text-muted);
    cursor: pointer;
    line-height: 1;
    transition: var(--transition-smooth);
}

.modal-close:hover {
    color: var(--color-text-primary);
    transform: rotate(90deg);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.donate-info p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.bank-info {
    background: var(--color-bg-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(181, 169, 154, 0.2);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.info-value {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--color-text-primary);
}

.copy-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.copy-text:hover {
    color: var(--color-primary);
}

.amount {
    color: var(--color-primary);
    font-size: 1.2rem;
}

.note {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--color-text-muted);
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
    }
    
    .container {
        padding: var(--spacing-sm);
    }
    
    .modal-content {
        padding: var(--spacing-lg);
    }
    
    .scratch-card {
        aspect-ratio: 3 / 4;
    }
}

@media (min-width: 768px) {
    .action-buttons {
        max-width: 300px;
        margin-left: auto;
        margin-right: auto;
    }
}

/* ================================
   Utility Classes
   ================================ */

.fade-in {
    animation: fadeIn 0.6s ease;
}

.slide-up {
    animation: slideUp 0.6s ease;
}

.hidden {
    display: none !important;
}