/**
 * MyMugBH - Custom Mug Designer
 * Main Stylesheet
 *
 * Design System:
 * - Dark theme with high contrast
 * - Modern, clean aesthetic
 * - Fully responsive
 * - Accessible (WCAG AA compliant)
 */

/* ========================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ======================================== */

:root {
    /* Colors - Dark Theme */
    --color-bg-primary: #0d0d0d;
    --color-bg-secondary: #1a1a1a;
    --color-bg-tertiary: #252525;
    --color-bg-elevated: #2a2a2a;
    --color-bg-hover: #333333;

    /* Text Colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #b3b3b3;
    --color-text-muted: #737373;
    --color-text-inverse: #0d0d0d;

    /* Accent Colors */
    --color-accent: #6366f1;
    --color-accent-hover: #818cf8;
    --color-accent-active: #4f46e5;

    /* Semantic Colors */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Border Colors */
    --color-border: #333333;
    --color-border-hover: #444444;
    --color-border-focus: var(--color-accent);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

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

    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-tooltip: 500;

    /* Layout */
    --header-height: 60px;
    --footer-height: 40px;
    --panel-width: 320px;
    --panel-width-lg: 380px;
}

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

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
}

/* Focus styles for accessibility */
:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

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

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

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

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-4);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    line-height: 1;
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
    min-height: 36px;
}

.btn:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border-hover);
}

.btn:active {
    background-color: var(--color-bg-elevated);
}

.btn-icon {
    padding: var(--space-2);
}

.btn-icon .icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-icon .btn-text {
    display: none;
}

@media (min-width: 640px) {
    .btn-icon .btn-text {
        display: inline;
    }

    .btn-icon {
        padding: var(--space-2) var(--space-3);
    }
}

.btn-primary {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-primary:active {
    background-color: var(--color-accent-active);
    border-color: var(--color-accent-active);
}

.btn-full {
    width: 100%;
}

.btn .icon {
    width: 16px;
    height: 16px;
}

/* Active state for toggle buttons */
.btn[aria-pressed="true"] {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

/* ========================================
   MAIN CONTENT LAYOUT
   ======================================== */

.main-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

@media (min-width: 768px) {
    .main-content {
        flex-direction: row;
    }
}

/* ========================================
   3D PREVIEW SECTION
   ======================================== */

.preview-section {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 300px;
    background-color: var(--color-bg-primary);
}

@media (min-width: 768px) {
    .preview-section {
        min-height: auto;
    }
}

.canvas-container {
    position: relative;
    flex: 1;
    background: radial-gradient(ellipse at center, #1a1a2e 0%, #0d0d0d 100%);
    overflow: hidden;
}

.canvas-container canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    background-color: var(--color-bg-primary);
    z-index: var(--z-overlay);
    transition: opacity var(--transition-normal);
}

.loading-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-bg-tertiary);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Error Overlay */
.error-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    background-color: var(--color-bg-primary);
    z-index: var(--z-overlay);
}

.error-icon {
    width: 48px;
    height: 48px;
    color: var(--color-error);
}

.error-overlay p {
    color: var(--color-text-secondary);
}

/* Preview Hint */
.preview-hint {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-align: center;
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.hint-mobile {
    display: none;
}

@media (hover: none) and (pointer: coarse) {
    .hint-desktop {
        display: none;
    }

    .hint-mobile {
        display: inline;
    }
}

/* ========================================
   CONTROLS PANEL
   ======================================== */

.controls-panel {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-height: 50vh;
    overflow-y: auto;
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .controls-panel {
        width: var(--panel-width);
        max-height: none;
        border-top: none;
        border-left: 1px solid var(--color-border);
    }
}

@media (min-width: 1024px) {
    .controls-panel {
        width: var(--panel-width-lg);
    }
}

/* Control Sections */
.control-section {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.control-section:last-child {
    border-bottom: none;
}

.section-title {
    margin-bottom: var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   DROP ZONE (IMAGE UPLOAD)
   ======================================== */

.drop-zone {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    padding: var(--space-4);
    background-color: var(--color-bg-tertiary);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition:
        border-color var(--transition-fast),
        background-color var(--transition-fast);
}

.drop-zone:hover,
.drop-zone:focus-visible {
    border-color: var(--color-accent);
    background-color: var(--color-bg-hover);
}

.drop-zone.drag-over {
    border-color: var(--color-accent);
    background-color: rgba(99, 102, 241, 0.1);
    border-style: solid;
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    text-align: center;
}

.upload-icon {
    width: 40px;
    height: 40px;
    color: var(--color-text-muted);
}

.drop-zone-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.browse-link {
    color: var(--color-accent);
    font-weight: var(--font-weight-medium);
}

.file-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Image Preview */
.image-preview {
    position: relative;
    width: 100%;
    height: 100%;
}

.image-preview img {
    width: 100%;
    height: 100%;
    max-height: 150px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.remove-image-btn {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.remove-image-btn:hover {
    background-color: var(--color-error);
    border-color: var(--color-error);
}

.remove-image-btn svg {
    width: 14px;
    height: 14px;
    color: var(--color-text-primary);
}

/* ========================================
   SHAPE SELECTOR
   ======================================== */

.shape-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-2);
}

@media (max-width: 767px) {
    .shape-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2);
    background-color: var(--color-bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition:
        border-color var(--transition-fast),
        background-color var(--transition-fast);
}

.shape-btn:hover {
    background-color: var(--color-bg-hover);
}

.shape-btn.active,
.shape-btn[aria-checked="true"] {
    border-color: var(--color-accent);
    background-color: rgba(99, 102, 241, 0.1);
}

.shape-icon {
    width: 36px;
    height: 36px;
    color: var(--color-text-primary);
}

.shape-btn span {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.shape-btn.active span,
.shape-btn[aria-checked="true"] span {
    color: var(--color-accent);
}

/* ========================================
   COLOR CONTROLS
   ======================================== */

.color-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.color-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.color-row label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.color-input {
    width: 40px;
    height: 40px;
    padding: 0;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: none;
}

.color-input::-webkit-color-swatch-wrapper {
    padding: 2px;
}

.color-input::-webkit-color-swatch {
    border: none;
    border-radius: var(--radius-sm);
}

.color-input::-moz-color-swatch {
    border: none;
    border-radius: var(--radius-sm);
}

.color-input:hover,
.color-input:focus-visible {
    border-color: var(--color-accent);
}

.color-value {
    font-size: var(--font-size-xs);
    font-family: ui-monospace, monospace;
    color: var(--color-text-muted);
    min-width: 60px;
}

/* ========================================
   PLACEMENT OPTIONS (RADIO BUTTONS)
   ======================================== */

.placement-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    border: none;
    margin-bottom: var(--space-4);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.radio-label:hover {
    background-color: var(--color-bg-hover);
}

.radio-label input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.radio-custom {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: border-color var(--transition-fast);
}

.radio-custom::after {
    content: '';
    width: 8px;
    height: 8px;
    background-color: var(--color-accent);
    border-radius: var(--radius-full);
    transform: scale(0);
    transition: transform var(--transition-fast);
}

.radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--color-accent);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
    transform: scale(1);
}

.radio-label input[type="radio"]:focus-visible + .radio-custom {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.radio-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.radio-label input[type="radio"]:checked ~ .radio-text {
    color: var(--color-text-primary);
}

/* ========================================
   SLIDER CONTROL
   ======================================== */

.slider-control {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.slider-control label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.slider-wrapper input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider-wrapper input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--color-accent);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
}

.slider-value {
    min-width: 40px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: right;
}

/* ========================================
   ACTIONS SECTION
   ======================================== */

.actions-section {
    margin-top: auto;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    display: flex;
    align-items: center;
    justify-content: center;
    height: var(--footer-height);
    padding: 0 var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.footer span {
    color: var(--color-error);
}

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

.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.controls-panel::-webkit-scrollbar-thumb:hover {
    background: var(--color-border-hover);
}

/* Firefox */
.controls-panel {
    scrollbar-width: thin;
    scrollbar-color: var(--color-bg-hover) var(--color-bg-secondary);
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .header,
    .footer,
    .controls-panel {
        display: none;
    }

    .preview-section {
        flex: none;
        width: 100%;
        height: auto;
    }
}