/*
 * DecoBike - Bike Rental System
 * Design System & Styles (RDM-inspired)
 * ======================================
 */

/* ===== CSS Variables / Design Tokens ===== */
:root {
    /* Primary Colors - Inspired by RDM dark theme */
    --color-primary: #0088cc;
    --color-primary-hover: #006da3;
    --color-primary-light: #e6f4fb;
    
    /* Success/Accent - Green for eco bikes */
    --color-success: #27ae60;
    --color-success-hover: #219a52;
    --color-success-light: #e8f8ef;
    
    /* Danger */
    --color-danger: #e74c3c;
    --color-danger-hover: #c0392b;
    
    /* Warning */
    --color-warning: #f39c12;
    
    /* Neutral Colors */
    --color-dark: #171717;
    --color-gray-900: #2c3e50;
    --color-gray-700: #555;
    --color-gray-500: #777;
    --color-gray-400: #999;
    --color-gray-300: #ccc;
    --color-gray-200: #e9ecef;
    --color-gray-100: #f5f5f5;
    --color-white: #fff;
    
    /* Background */
    --bg-body: #ecedf0;
    --bg-card: #fff;
    --bg-header: #171717;
    
    /* Typography */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    --font-size-base: 14px;
    --font-size-sm: 13px;
    --font-size-lg: 16px;
    --font-size-xl: 20px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;
    --line-height: 1.6;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
    
    /* 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 25px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    /* Container */
    --container-max: 1200px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-gray-700);
    background: var(--bg-body);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--space-md);
    font-weight: 600;
    color: var(--color-gray-900);
    line-height: 1.3;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
    margin: 0 0 var(--space-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ===== Header ===== */
.header {
    background: var(--bg-header);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 60px;
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-white);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.logo svg {
    width: 32px;
    height: 32px;
}

.logo span {
    background: linear-gradient(135deg, var(--color-success), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-link {
    color: var(--color-gray-300);
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-white);
    background: rgba(255,255,255,0.1);
}

.nav-link.active {
    color: var(--color-white);
    background: var(--color-primary);
}

/* Mobile menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    cursor: pointer;
    padding: var(--space-sm);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-header);
        flex-direction: column;
        padding: var(--space-md);
        gap: var(--space-sm);
    }
    
    .nav.open {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
    }
}

/* ===== Main Content ===== */
.main {
    padding-top: 60px;
    min-height: 100vh;
}

.section {
    padding: var(--space-2xl) 0;
}

.section-dark {
    background: var(--color-dark);
    color: var(--color-white);
}

.section-dark h2 {
    color: var(--color-white);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--color-dark) 0%, #2c3e50 100%);
    color: var(--color-white);
    padding: var(--space-2xl) 0;
    min-height: 500px;
    display: flex;
    align-items: center;
}

.hero-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero h1 {
    color: var(--color-white);
    font-size: 48px;
    margin-bottom: var(--space-md);
}

.hero h1 span {
    background: linear-gradient(135deg, var(--color-success), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: var(--font-size-lg);
    color: var(--color-gray-300);
    margin-bottom: var(--space-xl);
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.card-body {
    padding: var(--space-lg);
}

.card-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
}

.card-text {
    color: var(--color-gray-500);
    margin-bottom: var(--space-md);
}

/* Bike Card */
.bike-card {
    cursor: pointer;
}

.bike-card-image {
    height: 200px;
    background: var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
}

.bike-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bike-card-badge {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 12px;
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    margin-right: var(--space-xs);
}

.bike-card-badge.size {
    background: var(--color-success-light);
    color: var(--color-success);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    color: var(--color-white);
}

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

.btn-success:hover:not(:disabled) {
    background: var(--color-success-hover);
    color: var(--color-white);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
}

.btn-block {
    width: 100%;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--color-gray-700);
}

.form-control {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0,136,204,0.15);
}

.form-control::placeholder {
    color: var(--color-gray-400);
}

.form-control.error {
    border-color: var(--color-danger);
}

.form-error {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--space-xs);
}

/* ===== Grid ===== */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 992px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 576px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ===== Price Card ===== */
.price-card {
    text-align: center;
    padding: var(--space-xl);
    border: 2px solid transparent;
    transition: border-color var(--transition-base);
}

.price-card:hover {
    border-color: var(--color-primary);
}

.price-card.featured {
    border-color: var(--color-success);
    position: relative;
}

.price-card.featured::before {
    content: 'Popularne';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-success);
    color: var(--color-white);
    font-size: 12px;
    font-weight: 600;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
}

.price-value {
    font-size: 48px;
    font-weight: 700;
    color: var(--color-gray-900);
}

.price-value span {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--color-gray-500);
}

.price-label {
    font-size: var(--font-size-lg);
    color: var(--color-gray-500);
    margin-bottom: var(--space-md);
}

/* ===== Steps / Process Flow ===== */
.steps {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-xl);
}

.step {
    display: flex;
    align-items: center;
    color: var(--color-gray-400);
}

.step-num {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-right: var(--space-sm);
}

.step-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.step.active .step-num {
    background: var(--color-primary);
    color: var(--color-white);
}

.step.active .step-label {
    color: var(--color-gray-900);
}

.step.completed .step-num {
    background: var(--color-success);
    color: var(--color-white);
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--color-gray-200);
    margin: 0 var(--space-md);
}

.step.completed + .step-connector,
.step.active + .step-connector {
    background: var(--color-primary);
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    
    .step-connector {
        display: none;
    }
}

/* ===== Calendar ===== */
.calendar {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    background: var(--color-gray-100);
}

.calendar-title {
    font-weight: 600;
    margin: 0;
}

.calendar-nav {
    display: flex;
    gap: var(--space-sm);
}

.calendar-nav button {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-white);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.calendar-nav button:hover {
    background: var(--color-primary-light);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background: var(--color-gray-100);
    padding: var(--space-sm) var(--space-md);
    text-align: center;
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    padding: var(--space-sm);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.calendar-day:hover:not(.disabled):not(.booked) {
    background: var(--color-primary-light);
}

.calendar-day.selected {
    background: var(--color-primary);
    color: var(--color-white);
}

.calendar-day.in-range {
    background: var(--color-primary-light);
}

.calendar-day.disabled,
.calendar-day.past {
    color: var(--color-gray-300);
    cursor: not-allowed;
}

.calendar-day.booked {
    background: var(--color-danger);
    color: var(--color-white);
    opacity: 0.7;
    cursor: not-allowed;
}

.calendar-day.today {
    border: 2px solid var(--color-primary);
}

/* ===== Alerts ===== */
.alert {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.alert-success {
    background: var(--color-success-light);
    color: var(--color-success);
    border-left: 4px solid var(--color-success);
}

.alert-danger {
    background: #fdecea;
    color: var(--color-danger);
    border-left: 4px solid var(--color-danger);
}

.alert-warning {
    background: #fef5e7;
    color: #8a6d3b;
    border-left: 4px solid var(--color-warning);
}

.alert-info {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-left: 4px solid var(--color-primary);
}

/* ===== Tabs ===== */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--color-gray-200);
    margin-bottom: var(--space-lg);
}

.tab {
    padding: var(--space-md) var(--space-lg);
    font-weight: 500;
    color: var(--color-gray-500);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all var(--transition-fast);
}

.tab:hover {
    color: var(--color-gray-700);
}

.tab.active {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ===== Table ===== */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

.table th {
    font-weight: 600;
    color: var(--color-gray-900);
    background: var(--color-gray-100);
}

.table-responsive {
    overflow-x: auto;
}

/* Status badges */
.status-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.status-pending { background: #fef5e7; color: #8a6d3b; }
.status-confirmed { background: var(--color-success-light); color: var(--color-success); }
.status-completed { background: var(--color-gray-200); color: var(--color-gray-700); }
.status-cancelled { background: #fdecea; color: var(--color-danger); }

/* ===== Footer ===== */
.footer {
    background: var(--color-dark);
    color: var(--color-gray-400);
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer h4 {
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.footer a {
    color: var(--color-gray-400);
}

.footer a:hover {
    color: var(--color-white);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--space-lg);
    text-align: center;
    font-size: var(--font-size-sm);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Loader ===== */
.loader {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-gray-500); }

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

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

.p-0 { padding: 0; }
.p-1 { padding: var(--space-sm); }
.p-2 { padding: var(--space-md); }
.p-3 { padding: var(--space-lg); }
.p-4 { padding: var(--space-xl); }

.d-none { display: none; }
.d-flex { display: flex; }
.d-block { display: block; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-sm); }
.gap-2 { gap: var(--space-md); }
.gap-3 { gap: var(--space-lg); }

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

/* Visually hidden but 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: 0;
}