/**
 * dokufy Design System
 * Based on landing page design (LANDING_PAGE_DESIGN_DECISIONS.md)
 * Sprint 6 - December 2025
 */

/* ============================================================================
   CSS VARIABLES
   ============================================================================ */

:root {
    /* Colors - Monochromatic Base */
    --dokufy-black: #0A0A0A;
    --dokufy-gray-dark: #37352F;
    --dokufy-gray-medium: #787774;
    --dokufy-gray-light: #E3E2DD;
    --dokufy-off-white: #FAFAF9;

    /* Accent Color */
    --dokufy-accent: #0066FF;
    --dokufy-accent-hover: #0052CC;
    --dokufy-accent-light: rgba(0, 102, 255, 0.1);
    --dokufy-accent-border: rgba(0, 102, 255, 0.2);

    /* Status Colors */
    --dokufy-success: #22C55E;
    --dokufy-success-light: #F0FDF4;
    --dokufy-error: #EF4444;
    --dokufy-error-light: #FEF2F2;
    --dokufy-warning: #F59E0B;
    --dokufy-warning-light: #FFFBEB;
    --dokufy-info: #3B82F6;
    --dokufy-info-light: #EFF6FF;

    /* Spacing Scale */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ============================================================================
   BASE STYLES
   ============================================================================ */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--dokufy-black);
    background-color: var(--dokufy-off-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.5;
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

.text-display {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.text-h1 {
    font-size: 2.25rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.text-h2 {
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.25;
}

.text-h3 {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
}

.text-h4 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
}

.text-body-lg {
    font-size: 1.125rem;
    line-height: 1.6;
}

.text-body {
    font-size: 1rem;
    line-height: 1.5;
}

.text-body-sm {
    font-size: 0.875rem;
    line-height: 1.5;
}

.text-caption {
    font-size: 0.75rem;
    line-height: 1.4;
}

/* Text Colors */
.text-primary {
    color: var(--dokufy-black);
}

.text-secondary {
    color: var(--dokufy-gray-dark);
}

.text-tertiary {
    color: var(--dokufy-gray-medium);
}

.text-accent {
    color: var(--dokufy-accent);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
    background-color: var(--dokufy-accent);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--dokufy-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
    background-color: white;
    color: var(--dokufy-black);
    border: 1px solid var(--dokufy-gray-light);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--dokufy-off-white);
    border-color: var(--dokufy-gray-medium);
}

/* Ghost Button */
.btn-ghost {
    background-color: transparent;
    color: var(--dokufy-gray-dark);
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--dokufy-off-white);
    color: var(--dokufy-black);
}

/* Danger Button */
.btn-danger {
    background-color: var(--dokufy-error);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: #DC2626;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 0.8125rem;
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
    font-weight: 600;
}

/* ============================================================================
   CARDS
   ============================================================================ */

.card {
    background-color: white;
    border: 1px solid var(--dokufy-gray-light);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-normal);
}

.card-hover:hover {
    border-color: var(--dokufy-accent-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-flat {
    background-color: var(--dokufy-off-white);
    border: none;
}

/* ============================================================================
   BADGES
   ============================================================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

/* Status Badges */
.badge-success {
    background-color: var(--dokufy-success-light);
    color: #166534;
    border: 1px solid #BBF7D0;
}

.badge-error {
    background-color: var(--dokufy-error-light);
    color: #991B1B;
    border: 1px solid #FECACA;
}

.badge-warning {
    background-color: var(--dokufy-warning-light);
    color: #92400E;
    border: 1px solid #FDE68A;
}

.badge-info {
    background-color: var(--dokufy-info-light);
    color: #1E40AF;
    border: 1px solid #BFDBFE;
}

.badge-neutral {
    background-color: var(--dokufy-off-white);
    color: var(--dokufy-gray-dark);
    border: 1px solid var(--dokufy-gray-light);
}

.badge-primary {
    background-color: #F0FDFA;
    color: #0F766E;
    border: 1px solid #99F6E4;
}

.badge-accent {
    background-color: var(--dokufy-accent-light);
    color: var(--dokufy-accent);
    border: 1px solid var(--dokufy-accent-border);
}

/* ============================================================================
   FORM ELEMENTS
   ============================================================================ */

.label,
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--dokufy-black);
    margin-bottom: var(--space-3);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 1rem;
    font-family: inherit;
    color: var(--dokufy-black);
    background-color: white;
    border: 1px solid var(--dokufy-gray-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:hover {
    border-color: var(--dokufy-gray-medium);
}

.form-input:focus {
    outline: none;
    border-color: var(--dokufy-accent);
    box-shadow: 0 0 0 3px var(--dokufy-accent-light);
}

.form-input::placeholder {
    color: var(--dokufy-gray-medium);
}

.form-input:disabled {
    background-color: var(--dokufy-off-white);
    cursor: not-allowed;
}

/* Select */
.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 1rem;
    font-family: inherit;
    color: var(--dokufy-black);
    background-color: white;
    border: 2px solid var(--dokufy-gray-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23787774' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: var(--space-10);
    cursor: pointer;
}

.form-select:hover {
    border-color: var(--dokufy-gray-medium);
}

.form-select:focus {
    outline: none;
    border-color: var(--dokufy-accent);
    box-shadow: 0 0 0 3px var(--dokufy-accent-light);
}

.form-select:disabled {
    background-color: var(--dokufy-off-white);
    cursor: not-allowed;
}

/* Textarea */
.form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* Form Helper Text */
.form-helper {
    font-size: 0.8125rem;
    color: var(--dokufy-gray-medium);
    margin-top: var(--space-1);
}

.form-error {
    font-size: 0.8125rem;
    color: var(--dokufy-error);
    margin-top: var(--space-1);
}

/* ============================================================================
   TABLES
   ============================================================================ */

.table-container {
    overflow-x: auto;
    border: 1px solid var(--dokufy-gray-light);
    border-radius: var(--radius-xl);
    background-color: white;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: var(--space-4);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--dokufy-gray-medium);
    background-color: var(--dokufy-off-white);
    border-bottom: 1px solid var(--dokufy-gray-light);
}

.table td {
    padding: var(--space-4);
    font-size: 0.875rem;
    color: var(--dokufy-black);
    border-bottom: 1px solid var(--dokufy-gray-light);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background-color: var(--dokufy-off-white);
}

/* ============================================================================
   NAVIGATION
   ============================================================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background-color: rgba(250, 250, 249, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--dokufy-gray-light);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--dokufy-gray-dark);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--dokufy-black);
    background-color: var(--dokufy-off-white);
}

.nav-link.active {
    color: var(--dokufy-accent);
    background-color: var(--dokufy-accent-light);
}

/* ============================================================================
   ICON CONTAINERS
   ============================================================================ */

.icon-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background-color: var(--dokufy-accent-light);
    border: 1px solid var(--dokufy-accent-border);
}

.icon-container-lg {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-xl);
}

.icon-container svg {
    width: 24px;
    height: 24px;
    color: var(--dokufy-accent);
}

.icon-container-lg svg {
    width: 32px;
    height: 32px;
}

/* ============================================================================
   STATS
   ============================================================================ */

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dokufy-accent);
    line-height: 1.1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--dokufy-gray-medium);
    margin-top: var(--space-1);
}

/* ============================================================================
   ALERTS / BANNERS
   ============================================================================ */

.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
}

.alert-info {
    background-color: var(--dokufy-info-light);
    border: 1px solid #BFDBFE;
    color: #1E40AF;
}

.alert-success {
    background-color: var(--dokufy-success-light);
    border: 1px solid #BBF7D0;
    color: #166534;
}

.alert-warning {
    background-color: var(--dokufy-warning-light);
    border: 1px solid #FDE68A;
    color: #92400E;
}

.alert-error {
    background-color: var(--dokufy-error-light);
    border: 1px solid #FECACA;
    color: #991B1B;
}

/* ============================================================================
   EMPTY STATES
   ============================================================================ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-16) var(--space-8);
    min-height: 400px;
}

.empty-state .icon-container {
    margin-bottom: var(--space-6);
}

.empty-state .heading-4 {
    margin-bottom: var(--space-3);
}

.empty-state .body-base {
    max-width: 500px;
    margin: 0 auto var(--space-6);
}

/* ============================================================================
   SKELETON LOADING
   ============================================================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--dokufy-gray-light) 25%,
        var(--dokufy-off-white) 50%,
        var(--dokufy-gray-light) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

.animate-fade-in {
    animation: fadeIn 0.3s ease-out;
}

.animate-fade-in-up {
    animation: fadeInUp 0.4s ease-out;
}

.animate-slide-in-right {
    animation: slideInRight 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

/* Hover Effects */
.hover-lift {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

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

/* Backgrounds */
.bg-page {
    background-color: var(--dokufy-off-white);
}

.bg-card {
    background-color: white;
}

.bg-accent-light {
    background-color: var(--dokufy-accent-light);
}

/* Borders */
.border-default {
    border: 1px solid var(--dokufy-gray-light);
}

.border-accent {
    border: 1px solid var(--dokufy-accent-border);
}

/* Dividers */
.divider {
    height: 1px;
    background-color: var(--dokufy-gray-light);
    margin: var(--space-6) 0;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Spacing */
.section {
    padding: var(--space-20) 0;
}

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

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

::-webkit-scrollbar-track {
    background: var(--dokufy-off-white);
}

::-webkit-scrollbar-thumb {
    background: var(--dokufy-gray-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--dokufy-gray-medium);
}

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

@media (max-width: 768px) {
    .text-display {
        font-size: 2.25rem;
    }

    .text-h1 {
        font-size: 1.875rem;
    }

    .text-h2 {
        font-size: 1.5rem;
    }

    .stat-value {
        font-size: 2rem;
    }

    .container {
        padding: 0 var(--space-4);
    }

    .section {
        padding: var(--space-12) 0;
    }
}

/* ============================================================================
   RADIO BUTTON STYLES (for data retention page)
   ============================================================================ */

/* Screen reader only - hides radio buttons visually but keeps them accessible */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Peer selector - allows sibling elements to react to input state */
.retention-option input[type="radio"]:checked + div {
    border-color: var(--color-primary);
    background-color: var(--dokufy-info-light);
}