/**
 * Fast WhatsApp OTP - Black & White Theme
 * Bold, modern, professional design
 */

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

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-dark: #1a1a1a;
    --gray-medium: #666666;
    --gray-light: #e0e0e0;
    --gray-lighter: #f5f5f5;
}

/* Black and White Theme - Strict enforcement */
.header {
    background: var(--black) !important;
}

.header h1,
.header p {
    color: var(--white) !important;
}

.nav {
    background: var(--white) !important;
    border-bottom-color: var(--black) !important;
}

.nav a {
    color: var(--black) !important;
}

.nav a.active {
    border-bottom-color: var(--black) !important;
}

footer {
    background: var(--black) !important;
    color: var(--white) !important;
}

footer p {
    color: var(--white) !important;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 700;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--black);
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    font-weight: 500;
    color: var(--black);
    margin-bottom: 1rem;
}

a {
    color: var(--black);
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
    text-decoration: underline;
}

/* Header */
.header {
    background: var(--black);
    color: var(--white);
    padding: 1.5rem 2rem;
    border-bottom: 3px solid var(--black);
}

.header h1 {
    color: var(--white);
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
}

.header p {
    color: var(--white);
    font-weight: 500;
    font-size: 0.9rem;
    margin: 0.25rem 0 0 0;
    opacity: 0.9;
}

/* Sidebar Navigation */
.sidebar-toggle {
    display: none;
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: 2px solid var(--white);
    width: 40px;
    height: 40px;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    padding: 0;
    z-index: 1001;
}

.sidebar-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--white);
    transition: all 0.3s;
}

.sidebar-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.sidebar-toggle.active span:nth-child(2) {
    opacity: 0;
}

.sidebar-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.header {
    position: relative;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--white);
    border-right: 2px solid var(--black);
    z-index: 1000;
    overflow-y: auto;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 2px solid var(--black);
    background: var(--black);
}

.sidebar-header h2 {
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 800;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav li {
    border-bottom: 1px solid var(--gray-light);
}

.sidebar-nav li.sidebar-divider {
    border-bottom: 2px solid var(--black);
    margin: 0.5rem 0;
    padding: 0;
    height: 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    color: var(--black);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    border-left: 4px solid transparent;
    transition: all 0.2s;
    text-decoration: none;
}

.sidebar-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
    flex-shrink: 0;
}

.sidebar-nav a span {
    flex: 1;
}

.sidebar-nav a:hover {
    background: var(--gray-lighter);
    border-left-color: var(--black);
    text-decoration: none;
    opacity: 1;
}

.sidebar-nav a:hover .sidebar-icon {
    transform: scale(1.1);
}

.sidebar-nav a.active {
    background: var(--black);
    color: var(--white);
    border-left-color: var(--black);
}

.sidebar-nav a.active .sidebar-icon {
    color: var(--white);
}

.sidebar-nav a.logout-link {
    background: var(--black);
    color: var(--white);
    margin-top: auto;
}

.sidebar-nav a.logout-link:hover {
    background: var(--gray-dark);
    border-left-color: var(--black);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* Main content adjustment for sidebar */
body.has-sidebar {
    padding-left: 280px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Cards */
.card {
    background: var(--white);
    border: 2px solid var(--black);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 4px 4px 0 var(--black);
}

.card-header {
    border-bottom: 2px solid var(--black);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.card-header h2 {
    margin: 0;
    font-weight: 700;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    background: var(--black);
    color: var(--white);
    border: 2px solid var(--black);
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn:hover {
    background: var(--white);
    color: var(--black);
    text-decoration: none;
    opacity: 1;
}

.btn-secondary {
    background: var(--white);
    color: var(--black);
    border: 2px solid var(--black);
}

.btn-secondary:hover {
    background: var(--black);
    color: var(--white);
}

.btn-danger {
    background: var(--black);
    color: var(--white);
}

.btn-danger:hover {
    background: var(--white);
    color: var(--black);
}

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

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--black);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--black);
    background: var(--white);
    color: var(--black);
    font-weight: 600;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.2s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--gray-light);
}

input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

small {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-medium);
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    border: 2px solid var(--black);
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--black);
    font-weight: 600;
}

.table th {
    background: var(--black);
    color: var(--white);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

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

.table tr:hover {
    background: var(--gray-lighter);
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border: 2px solid var(--black);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.alert-success {
    background: var(--white);
    border-color: var(--black);
    color: var(--black);
}

.alert-error {
    background: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.alert-info {
    background: var(--gray-lighter);
    border-color: var(--black);
    color: var(--black);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border: 2px solid var(--black);
    padding: 2rem;
    box-shadow: 4px 4px 0 var(--black);
}

.stat-card h3 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray-medium);
    margin-bottom: 1rem;
}

.stat-card .value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--black);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-card .label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-medium);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border: 2px solid var(--black);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background: var(--white);
    color: var(--black);
    border-color: var(--black);
}

.badge-warning {
    background: var(--black);
    color: var(--white);
}

.badge-danger {
    background: var(--black);
    color: var(--white);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--gray-medium);
}

.empty-state h3 {
    font-weight: 700;
    margin-bottom: 1rem;
}

/* Code */
code {
    background: var(--gray-lighter);
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--black);
    font-family: 'Courier New', monospace;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.ml-auto { margin-left: auto; }
.d-flex { display: flex; }
.gap-1 { gap: 1rem; }
.gap-2 { gap: 2rem; }

/* Responsive */
@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    body.has-sidebar {
        padding-left: 0;
    }
    
    .container {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .header h1 {
        font-size: 1.25rem;
        padding-left: 3rem;
    }
    
    .header p {
        font-size: 0.8rem;
        padding-left: 3rem;
    }
}

@media (min-width: 769px) {
    body.has-sidebar {
        padding-left: 280px;
    }
}

/* Public Navigation */
.public-nav {
    background: var(--white);
    border-bottom: 3px solid var(--black);
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.public-nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.public-nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
}

.public-nav-brand a {
    color: var(--black);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.public-nav-toggle {
    display: none;
    background: transparent;
    border: 2px solid var(--black);
    width: 40px;
    height: 40px;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    padding: 0;
}

.public-nav-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--black);
    transition: all 0.3s;
}

.public-nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.public-nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.public-nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.public-nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
    margin: 0;
    padding: 0;
}

.public-nav-menu li {
    margin: 0;
}

.public-nav-menu a {
    color: var(--black);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.public-nav-menu a:hover {
    border-bottom-color: var(--black);
}

.public-nav-menu a.active {
    border-bottom-color: var(--black);
    font-weight: 800;
}

.public-nav-menu a.nav-login {
    border: 2px solid var(--black);
    padding: 0.5rem 1.5rem;
    border-radius: 0;
}

.public-nav-menu a.nav-signup {
    background: var(--black);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--black);
}

.public-nav-menu a.nav-signup:hover {
    background: var(--white);
    color: var(--black);
}

@media (max-width: 768px) {
    .public-nav-toggle {
        display: flex;
    }
    
    .public-nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        border-top: 2px solid var(--black);
        flex-direction: column;
        padding: 1rem 0;
        gap: 0;
        display: none;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }
    
    .public-nav-menu.active {
        display: flex;
    }
    
    .public-nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--gray-light);
    }
    
    .public-nav-menu a {
        display: block;
        padding: 1rem 2rem;
        border-bottom: none;
    }
    
    .public-nav-menu a.nav-login,
    .public-nav-menu a.nav-signup {
        margin: 0.5rem 2rem;
        text-align: center;
    }
}

/* Hero Section */
.hero {
    background: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 4rem auto 0;
}

.hero-stat {
    padding: 2rem;
    border: 2px solid var(--black);
    background: var(--white);
}

.hero-stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.hero-stat-label {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Features Section */
.features-section {
    padding: 6rem 2rem;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    padding: 2rem;
    border: 2px solid var(--black);
    background: var(--white);
    transition: all 0.3s;
}

.feature-card:hover {
    box-shadow: 8px 8px 0 var(--black);
    transform: translate(-2px, -2px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 1.5rem;
    stroke-width: 2;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.feature-card p {
    font-weight: 600;
    line-height: 1.8;
}

/* Content Pages */
.content-page {
    padding: 4rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.content-page h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--black);
    padding-bottom: 1rem;
}

.content-page h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.content-page h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-page p {
    font-weight: 600;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.content-page ul,
.content-page ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.content-page li {
    font-weight: 600;
    line-height: 1.8;
    margin-bottom: 0.75rem;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.2rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .content-page h1 {
        font-size: 2rem;
    }
    
    .content-page h2 {
        font-size: 1.5rem;
    }
}