/* 
    RhythmAI Design System
    Theme: Modern, Calm, Healthcare B2B
*/

:root {
    /* Colors */
    --primary: #0061A6;
    --primary-light: #E1F0FF;
    --primary-dark: #00457A;
    --secondary: #4C627B;
    --accent: #00A3BF;
    --accent-light: #E0F7FA;
    
    --background: #FFFFFF;
    --surface: #F8FBFF;
    --surface-variant: #EEF3F8;
    
    --text-primary: #1A1C1E;
    --text-secondary: #44474E;
    --text-hint: #74777F;
    
    --error: #BA1A1A;
    --success: #2E7D32;
    
    /* Typography */
    --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-standard: 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --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);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
}

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

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

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

.flex { display: flex; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

.grid {
    display: grid;
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Color utilities */
.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-hint { color: var(--text-hint) !important; }
.text-accent { color: var(--accent) !important; }
.text-success { color: var(--success) !important; }
.text-error { color: var(--error) !important; }
.text-white { color: #fff !important; }

/* Spacing utilities */
.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

/* UI Components */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-standard);
    font-size: 0.95rem;
    gap: 0.5rem;
    font-family: inherit;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-outline-light {
    background-color: transparent;
    border: 2px solid rgba(255,255,255,0.5);
    color: var(--text-secondary);
}

.btn-outline-light:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-text {
    color: var(--primary);
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

.btn-text:hover {
    text-decoration: underline;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

/* Cards */
.card {
    background: white;
    border-radius: 20px;
    padding: var(--space-lg);
    border: 1px solid var(--surface-variant);
    transition: all var(--transition-standard);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

/* Glassmorphism */
.glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ==========================================
   Navigation
   ========================================== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all var(--transition-standard);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

header.scrolled {
    box-shadow: var(--shadow-sm);
    padding: 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    gap: 1rem;
}

.logo img {
    height: 36px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.95rem;
    white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

/* Auth button group in nav */
.nav-auth-group {
    display: flex;
    align-items: center;
    background: var(--surface-variant);
    border-radius: 50px;
    padding: 4px;
    gap: 4px;
}

.nav-auth-group .btn {
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.85rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    height: auto;
}

.nav-auth-group .btn-login:hover {
    color: var(--primary);
}

.nav-auth-group .btn-register {
    background: white;
    color: var(--primary) !important;
    border: 1px solid var(--primary-light) !important;
    box-shadow: var(--shadow-sm);
}

.nav-auth-group .btn-register:hover {
    background: var(--primary) !important;
    color: white !important;
    border-color: var(--primary) !important;
}

/* Auth buttons wrapper */
.nav-auth {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Mobile hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-primary);
}

.hamburger .material-icons {
    font-size: 28px;
}

/* Mobile nav */
@media (max-width: 992px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-md);
        gap: 0;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--surface-variant);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links .nav-link {
        display: block;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--surface-variant);
    }

    .hamburger {
        display: block;
    }

    .nav-auth .btn-outline-light {
        display: none;
    }
}

@media (max-width: 576px) {
    .nav-auth .btn-sm:first-child {
        display: none;
    }
}

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--surface-variant);
    border-radius: 10px;
    background: var(--surface);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition-standard);
    color: var(--text-primary);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

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

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

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

/* ==========================================
   Footer
   ========================================== */
footer {
    background-color: var(--surface-variant);
    padding: var(--space-2xl) 0 var(--space-lg);
}

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

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

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-col h4 {
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: var(--text-hint);
    font-size: 0.9rem;
}

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

.footer-bottom {
    margin-top: var(--space-xl);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-hint);
    flex-wrap: wrap;
    gap: 1rem;
}

/* ==========================================
   Responsive helpers
   ========================================== */
@media (max-width: 768px) {
    .section {
        padding: var(--space-xl) 0;
    }

    h1 {
        font-size: 2rem !important;
    }

    h2 {
        font-size: 1.5rem !important;
    }

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

/* Specialties Section */
.specialties-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.specialties-title-box {
    flex: 1;
    min-width: 300px;
}

.specialties-tabs {
    display: flex;
    gap: 0.5rem;
}

.specialty-tab {
    padding: 0.6rem 1.25rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--secondary);
    border: 1.5px solid var(--secondary);
    background: transparent;
    transition: all var(--transition-standard);
    white-space: nowrap;
}

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

.specialty-tab:hover:not(.active) {
    border-color: var(--primary);
    color: var(--primary);
}

.specialties-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

@media (min-width: 576px) {
    .specialties-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
    .specialties-grid { grid-template-columns: repeat(6, 1fr); }
}

.specialty-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl) var(--space-sm);
    text-align: center;
    background: white;
    border: 1px solid var(--surface-variant);
    border-radius: 16px;
    transition: all var(--transition-standard);
    min-height: 160px;
    cursor: pointer;
}

.specialty-card .material-icons-outlined {
    font-size: 2.5rem;
    margin-bottom: 1.25rem;
    color: var(--secondary);
    opacity: 0.7;
    font-weight: 300;
}

.specialty-card h4 {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.3;
}

.specialty-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.specialty-card:hover .material-icons-outlined {
    color: var(--primary);
    opacity: 1;
}

.specialty-promo-card {
    background: #E1F4FA; /* Matching the light blue in the image */
    border: none;
    align-items: flex-start;
    text-align: left;
    padding: var(--space-md);
    justify-content: space-between;
}

.specialty-promo-card h4 {
    font-size: 1.05rem;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 1rem;
}

.btn-view-all-small {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.4rem 0.8rem;
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
}

.specialty-promo-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal-overlay.flex {
    display: flex;
}

.modal-box {
    background: white;
    width: 100%;
    border-radius: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    padding: 2.5rem;
    position: relative;
    animation: modalSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}