/* ==========================================
   DESIGN SYSTEM & CSS VARIABLES
   ========================================== */

:root {
    /* Color Palette */
    --color-primary: #4834df;
    --color-primary-light: #6c5ce7;
    --color-primary-dark: #341f97;

    --color-secondary: #05c46b;
    --color-secondary-light: #0be881;

    --color-accent: #ffa502;
    --color-accent-light: #ffd32a;

    --color-bg-dark: #0a0e27;
    --color-bg-darker: #050814;
    --color-bg-card: rgba(15, 20, 45, 0.85);
    --color-bg-overlay: rgba(5, 8, 20, 0.95);

    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a8c5;
    --color-text-muted: #6b7280;

    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-light: rgba(255, 255, 255, 0.05);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #ffa502 0%, #ff6348 100%);
    --gradient-success: linear-gradient(135deg, #0be881 0%, #05c46b 100%);
    --gradient-sky: linear-gradient(180deg, #1e3c72 0%, #2a5298 50%, #7e8ba3 100%);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(72, 52, 223, 0.5);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-handwriting: 'Caveat', cursive;
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */

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

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

body {
    font-family: var(--font-primary);
    background: var(--gradient-sky);
    color: var(--color-text-primary);
    overflow: hidden;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(72, 52, 223, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(5, 196, 107, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ==========================================
   LOADING SCREEN
   ========================================== */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-sky);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

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

.tree-loader {
    width: 80px;
    height: 100px;
    margin: 0 auto var(--spacing-lg);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.tree-trunk {
    width: 20px;
    height: 40px;
    background: linear-gradient(180deg, #8b4513 0%, #654321 100%);
    margin: 0 auto;
    border-radius: 4px;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.tree-leaves {
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-bottom: 60px solid var(--color-secondary);
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: translateX(-50%) scale(1);
    }

    50% {
        opacity: 0.8;
        transform: translateX(-50%) scale(1.05);
    }
}

.loading-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% {
        width: 0%;
    }

    50% {
        width: 70%;
    }

    100% {
        width: 100%;
    }
}

/* ==========================================
   APP CONTAINER
   ========================================== */

.app-container {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    z-index: 1;
}

/* ==========================================
   HEADER
   ========================================== */

.app-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: transparent !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    border: none !important;
    box-shadow: none !important;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 10;
}

.header-content {
    flex: 1;
}

.app-title {
    font-size: 2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.title-icon {
    font-size: 2.5rem;
}


.app-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
}

.header-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    min-width: 100px;
    box-shadow: var(--shadow-glow);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   CANVAS CONTAINER
   ========================================== */

.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#tree-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: grab;
}

#tree-canvas:active {
    cursor: grabbing;
}

/* ==========================================
   CONTROLS HINT
   ========================================== */

.controls-hint {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-md);
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.5s ease-out 1s both;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.hint-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.hint-icon {
    font-size: 1.2rem;
}

/* ==========================================
   ADD WISH BUTTON
   ========================================== */

.add-wish-btn {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    transition: all var(--transition-base);
    z-index: 100;
}

.add-wish-btn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-xl), 0 0 30px rgba(72, 52, 223, 0.7);
}

.add-wish-btn:active {
    transform: translateY(-2px) scale(1.02);
}

.add-wish-btn .btn-icon {
    font-size: 1.5rem;
    animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {

    0%,
    100% {
        transform: scale(1) rotate(0deg);
    }

    25% {
        transform: scale(1.2) rotate(-10deg);
    }

    75% {
        transform: scale(1.2) rotate(10deg);
    }
}

/* ==========================================
   MODAL
   ========================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg-overlay);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background: var(--color-border);
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

.modal-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ==========================================
   FORM STYLES
   ========================================== */

.wish-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-primary);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    font-family: var(--font-handwriting);
    font-size: 1.2rem;
    line-height: 1.6;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 4px rgba(72, 52, 223, 0.1);
}

.char-counter {
    text-align: right;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ==========================================
   COLOR PICKER
   ========================================== */

.color-picker {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.color-option {
    width: 50px;
    height: 50px;
    border: 3px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.color-option:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.color-option.active {
    border-color: var(--color-text-primary);
    box-shadow: var(--shadow-glow);
}

.color-option.active::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* ==========================================
   SUBMIT BUTTON
   ========================================== */

.submit-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gradient-success);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    margin-top: var(--spacing-md);
}

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

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

/* ==========================================
   READ MODAL
   ========================================== */

.ribbon-preview {
    width: 80px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    position: relative;
}

.ribbon-preview::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-top: 15px solid inherit;
}

.wish-content {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.wish-text {
    font-family: var(--font-handwriting);
    font-size: 1.5rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.wish-author {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-xs);
}

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

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .app-title {
        font-size: 1.5rem;
    }

    .title-icon {
        font-size: 2rem;
    }

    .controls-hint {
        bottom: var(--spacing-md);
        padding: var(--spacing-xs) var(--spacing-md);
        gap: var(--spacing-sm);
    }

    .hint-item {
        font-size: 0.75rem;
    }

    .add-wish-btn {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .modal-content {
        padding: var(--spacing-lg);
    }

    .color-picker {
        gap: var(--spacing-xs);
    }

    .color-option {
        width: 40px;
        height: 40px;
    }
}

/* ==========================================
   SCROLLBAR STYLING
   ========================================== */

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

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

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-light);
}

/* ==========================================
   ROTATION CONTROLS
   ========================================== */

.rotation-controls {
    position: fixed;
    top: var(--spacing-xl);
    left: var(--spacing-xl);
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    min-width: 280px;
    box-shadow: var(--shadow-lg);
    z-index: 100;
}

.rotation-controls h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.control-group {
    margin-bottom: var(--spacing-md);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-glow);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.control-group input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-glow);
}

.reset-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-accent);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    margin-top: var(--spacing-sm);
}

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

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