/* ========================
   TYPOGRAPHY & BASE STYLES
   ======================== */

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --light-bg: #f8fafc;
    --dark-bg: #1e293b;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --spacing-base: 1rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #fff;
    overflow-x: hidden;
}

/* ========================
   HEADINGS
   ======================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

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

.btn {
    font-weight: 600;
    border-radius: 0.5rem;
    padding: 0.5rem 1.25rem;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:focus,
.btn-primary:active:focus {
    box-shadow: 0 0 0 0.25rem rgba(37, 99, 235, 0.25);
}

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

.btn-secondary:hover {
    background-color: #475569;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(100, 116, 139, 0.3);
}

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

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.125rem;
}

/* ========================
   FORMS & INPUTS
   ======================== */

.form-control,
.form-select {
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    padding: 0.625rem 0.875rem;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: #fff;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.1);
    background-color: #fff;
}

.form-label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.input-group-text {
    background-color: var(--light-bg);
    border-color: var(--border-color);
    font-weight: 600;
    color: var(--text-secondary);
}

.invalid-feedback {
    display: block;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

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

.card {
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.card-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.25rem;
    background-color: var(--light-bg);
}

/* ========================
   ALERTS & MESSAGES
   ======================== */

.alert {
    border-radius: 0.5rem;
    border: none;
    padding: 1rem 1.25rem;
    font-weight: 500;
}

.alert-success {
    background-color: #ecfdf5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.alert-warning {
    background-color: #fffbeb;
    color: #78350f;
    border-left: 4px solid var(--warning-color);
}

.alert-danger {
    background-color: #fef2f2;
    color: #7f1d1d;
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background-color: #ecf0ff;
    color: #3730a3;
    border-left: 4px solid var(--primary-color);
}

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

.navbar {
    padding: 1rem 0;
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary) !important;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

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

footer {
    background-color: var(--dark-bg);
    color: #cbd5e1;
    margin-top: auto;
}

footer a {
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

footer h6 {
    color: #f1f5f9;
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

/* ========================
   SECTIONS & SPACING
   ======================== */

section {
    padding: 3rem 0;
}

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

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

.container {
    max-width: 1200px;
}

/* ========================
   HERO SECTION
   ======================== */

.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 768px) {
    .hero {
        padding: 2rem 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
}

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

.feature-card {
    text-align: center;
    padding: 2rem 1.5rem;
    border-radius: 0.75rem;
    background-color: white;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
}

.feature-card h5 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0;
}

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

.step-card {
    position: relative;
    padding: 2rem;
    text-align: left;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* ========================
   UTILITIES
   ======================== */

.min-vh-100 {
    min-height: 100vh;
}

.flex-grow-1 {
    flex-grow: 1;
}

.d-flex {
    display: flex;
}

.flex-column {
    flex-direction: column;
}

.gap-2 {
    gap: 0.5rem;
}

.gap-3 {
    gap: 1rem;
}

.gap-4 {
    gap: 1.5rem;
}

.mt-5 {
    margin-top: 3rem;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
}

.text-light {
    color: var(--text-light);
}

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

.shadow-sm {
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.shadow {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.border-bottom {
    border-bottom: 1px solid var(--border-color);
}

.border-top {
    border-top: 1px solid var(--border-color);
}

.hover-link {
    transition: all 0.3s ease;
}

.hover-link:hover {
    color: var(--primary-color) !important;
    text-decoration: underline;
}

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

@media (max-width: 768px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    section {
        padding: 2rem 0;
    }
    
    .feature-card {
        margin-bottom: 1.5rem;
    }
}

/* ========================
   ACCESSIBILITY
   ======================== */

.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;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}