/* EasyGN E-Signature Application - Centralized Styles */
/* Design System v1.0 */

/* ===== CSS CUSTOM PROPERTIES (COLOR TOKENS) ===== */
:root {
    /* Background Colors */
    --bg-primary: #000;
    --bg-secondary: #111;
    --bg-tertiary: #1a1a1a;
    --bg-quaternary: #222;
    
    /* Text Colors */
    --text-primary: #fff;
    --text-secondary: #888;
    --text-tertiary: #ccc;
    --text-quaternary: #666;
    
    /* Accent Colors */
    --accent-success: #4ade80;
    --accent-error: #f87171;
    --accent-warning: #fbbf24;
    --accent-info: #3b82f6;
    
    /* Border Colors */
    --border-primary: #333;
    --border-secondary: #666;
    --border-accent: #555;
    
    /* Layout Tokens */
    --container-max-width: 600px;
    --container-max-width-narrow: 500px;
    --container-max-width-wide: 800px;
    --container-padding: 20px;
    --container-padding-mobile: 10px;
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    --spacing-xxl: 40px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 12px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.8rem;
    --font-size-sm: 0.9rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.1rem;
    --font-size-xl: 1.2rem;
    --font-size-2xl: 2rem;
    
    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1.6;
}

/* ===== LAYOUT COMPONENTS ===== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    padding: var(--container-padding);
}

.container-narrow {
    max-width: var(--container-max-width-narrow);
}

.container-wide {
    max-width: var(--container-max-width-wide);
}

/* ===== HEADER COMPONENTS ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.header h1 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-light);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* ===== FORM COMPONENTS ===== */
.form-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-primary);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--border-secondary);
}

/* ===== BUTTON COMPONENTS ===== */
.btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-block;
    text-align: center;
    font-family: var(--font-family);
}

.btn:hover {
    background: #f0f0f0;
    transform: translateY(-1px);
}

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

.btn:disabled {
    background: var(--border-primary);
    color: var(--text-quaternary);
    cursor: not-allowed;
    transform: none;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
}

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

.btn-success {
    background: var(--accent-success);
    color: var(--bg-primary);
}

.btn-success:hover {
    background: #22c55e;
}

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

.btn-error:hover {
    background: #ef4444;
}

/* ===== FILE INPUT COMPONENTS ===== */
.file-input-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

.file-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-input-button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    border: 2px dashed var(--border-secondary);
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    cursor: pointer;
    transition: all var(--transition-normal);
    min-height: 120px;
    flex-direction: column;
}

.file-input-button:hover {
    border-color: var(--border-secondary);
    background: var(--bg-quaternary);
}

.file-input-button i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-quaternary);
}

.file-input-button span {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-align: center;
}

/* ===== CARD COMPONENTS ===== */
.card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-primary);
    margin-bottom: var(--spacing-lg);
}

.card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
}

.card h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

/* ===== INFO COMPONENTS ===== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
}

.info-item i {
    color: var(--text-quaternary);
    width: 16px;
    text-align: center;
}

/* ===== ALERT COMPONENTS ===== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    border: 1px solid var(--border-primary);
}

.alert-success {
    background: var(--bg-tertiary);
    color: var(--accent-success);
    border-color: var(--border-primary);
}

.alert-error {
    background: var(--bg-tertiary);
    color: var(--accent-error);
    border-color: var(--border-primary);
}

.alert-warning {
    background: var(--bg-tertiary);
    color: var(--accent-warning);
    border-color: var(--border-primary);
}

.alert-info {
    background: var(--bg-tertiary);
    color: var(--accent-info);
    border-color: var(--border-primary);
}

/* ===== NAVIGATION COMPONENTS ===== */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--border-primary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-accent);
}

.back-btn:hover {
    background: var(--border-secondary);
    border-color: var(--border-secondary);
    color: var(--text-primary);
}

.back-btn i {
    font-size: var(--font-size-xs);
}

/* ===== PROGRESS COMPONENTS ===== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-primary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: var(--text-primary);
    border-radius: var(--radius-sm);
    width: 0%;
    transition: width var(--transition-normal);
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ===== STEP INDICATOR ===== */
.step-indicator {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xxl);
    gap: var(--spacing-sm);
}

.step {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    transition: all var(--transition-normal);
    font-size: var(--font-size-sm);
}

.step.active {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.step.inactive {
    background: var(--border-primary);
    color: var(--text-quaternary);
}

.step.completed {
    background: var(--accent-success);
    color: var(--bg-primary);
}

/* ===== SLIDER COMPONENTS ===== */
.slider-group {
    margin-bottom: var(--spacing-lg);
}

.slider-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slider {
    flex: 1;
    height: 6px;
    background: var(--border-primary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.slider-value {
    min-width: 40px;
    text-align: center;
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
}

/* ===== GRID COMPONENTS ===== */
.page-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.page-thumbnail {
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--text-primary);
}

.page-thumbnail:hover {
    border-color: var(--border-secondary);
    background: #f0f0f0;
}

.page-thumbnail.selected {
    border-color: var(--accent-success);
    background: #e8f5e8;
}

.page-thumbnail img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
}

.page-number {
    font-weight: var(--font-weight-semibold);
    color: #333;
    font-size: var(--font-size-xs);
}

/* ===== WYSIWYG COMPONENTS ===== */
.wysiwyg-container {
    background: var(--text-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-primary);
    position: relative;
    overflow: hidden;
}

.wysiwyg-container h3 {
    color: #333;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.pdf-preview {
    position: relative;
    display: inline-block;
    max-width: 100%;
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--text-primary);
}

.pdf-page {
    width: 100%;
    height: auto;
    display: block;
    cursor: default;
}

.signature-overlay {
    position: absolute;
    cursor: move;
    border: 2px dashed var(--border-secondary);
    background: rgba(102, 102, 102, 0.1);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    z-index: 10;
    min-width: 20px;
    min-height: 20px;
}

.signature-overlay:hover {
    border-color: var(--accent-error);
    background: rgba(248, 113, 113, 0.1);
    cursor: zoom-in;
}

.signature-overlay img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ===== ACTION BUTTONS ===== */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .container {
        padding: var(--container-padding-mobile);
    }
    
    .form-container {
        padding: var(--spacing-lg);
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .page-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .slider-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .slider-value {
        text-align: left;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
        /* Mobile-specific button improvements */
        min-height: 50px;
        font-size: 16px;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        -khtml-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
    }
    
    /* Mobile-specific button states */
    .btn:active {
        transform: scale(0.98);
        background: #e0e0e0;
    }
    
    .btn:focus {
        outline: 2px solid #4ade80;
        outline-offset: 2px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .form-container {
        padding: var(--spacing-md);
    }
    
    .header h1 {
        font-size: 1.25rem;
    }
    
    .step-indicator {
        gap: var(--spacing-xs);
    }
    
    .step {
        width: 30px;
        height: 30px;
        font-size: var(--font-size-xs);
    }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

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

.w-full { width: 100%; }
.h-full { height: 100%; }

/* ===== MOBILE FULLSCREEN OPTIMIZATION ===== */
/* Detect mobile devices and optimize for fullscreen */
@media screen and (max-width: 768px) {
    /* Reset body and html for fullscreen mobile */
    html, body {
        height: 100vh;
        height: 100dvh; /* Dynamic viewport height for mobile */
        overflow: hidden;
        margin: 0;
        padding: 0;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
    }
    
    /* Make container use full viewport */
    .container {
        height: 100vh;
        height: 100dvh;
        max-width: none;
        width: 100%;
        padding: 0;
        margin: 0;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }
    
    /* Header optimization for mobile */
    .header {
        flex-shrink: 0;
        padding: var(--spacing-sm);
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-primary);
    }
    
    .header h1 {
        font-size: 1.2rem;
        margin: 0;
    }
    
    .header p {
        font-size: 0.9rem;
        margin: var(--spacing-xs) 0 0 0;
    }
    
    /* Form container takes remaining space */
    .form-container {
        flex: 1;
        overflow-y: auto;
        overflow-x: hidden;
        padding: var(--spacing-sm);
        -webkit-overflow-scrolling: touch;
    }
    
    /* PDF viewer fullscreen on mobile */
    .pdf-viewer-container {
        height: calc(100vh - 200px);
        height: calc(100dvh - 200px);
        max-height: none;
        overflow: hidden;
    }
    
    .current-page {
        height: 100%;
        max-height: none;
    }
    
    .current-page img {
        width: 100%;
        height: 100%;
        object-fit: contain;
    }
    
    /* Floating footer optimization */
    .floating-footer {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        padding: var(--spacing-sm);
    }
    
    /* Adjust body padding for floating footer */
    body {
        padding-bottom: 60px;
    }
    
    /* Hide unnecessary elements on mobile */
    .zoom-controls {
        display: none;
    }
    
    .zoom-info {
        display: none;
    }
    
    /* Navigation buttons optimization */
    .nav-controls {
        position: fixed;
        top: 50%;
        transform: translateY(-50%);
        z-index: 100;
    }
    
    .nav-controls .nav-btn {
        background: rgba(0,0,0,0.7);
        color: white;
        border: 1px solid rgba(255,255,255,0.3);
        backdrop-filter: blur(10px);
    }
    
    .nav-controls .nav-btn:first-child {
        position: fixed;
        left: var(--spacing-sm);
    }
    
    .nav-controls .nav-btn:last-child {
        position: fixed;
        right: var(--spacing-sm);
    }
    
    /* Page info optimization */
    .page-info {
        position: fixed;
        bottom: 80px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(0,0,0,0.8);
        color: white;
        padding: var(--spacing-xs) var(--spacing-sm);
        border-radius: var(--radius-sm);
        font-size: 0.9rem;
        z-index: 100;
    }
    
    /* Alert optimization */
    .alert {
        margin: var(--spacing-sm) 0;
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    /* Button optimization */
    .btn {
        width: 100%;
        padding: var(--spacing-md);
        font-size: 1rem;
        margin: var(--spacing-sm) 0;
    }
    
    /* File input optimization */
    .file-input-wrapper {
        margin: var(--spacing-sm) 0;
    }
    
    .file-input-button {
        padding: var(--spacing-lg);
        font-size: 1rem;
    }
    
    /* Progress bar optimization */
    .progress-bar {
        height: 8px;
        margin: var(--spacing-sm) 0;
    }
    
    .progress-text {
        font-size: 0.9rem;
        margin-top: var(--spacing-xs);
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
    
    .btn, .back-btn {
        display: none;
    }
}