/**
 * Master Stylesheet - Healthcare & Doctor Appointment System
 * Theme: Corporate Slate Blue & Ice White (Premium UI)
 * Includes: Homepage, Booking, Auth (Login/Register), & Patient Dashboard.
 */

:root {
    /* Core Slate Blue Palette */
    --primary-color: #5A72A0;         
    --primary-hover: #455C8A;         
    --secondary-color: #1C2733;       
    --secondary-hover: #121A24;       
    
    /* Backgrounds & Surfaces */
    --bg-light: #F4F7F9;              
    --surface-white: #FFFFFF;         
    --accent-light: #EBF0F5;          
    
    /* Typography */
    --text-dark: #2C3E50;             
    --text-muted: #6B7A8F;            
    
    /* Status Colors */
    --border-color: #DDE4EB;          
    --danger-color: #E63946;
    --danger-bg: #FDECEC;
    --success-color: #2A9D8F;
    --success-bg: #E9F5F4;
    
    /* UI Elements */
    --border-radius: 8px;             
    --box-shadow: 0 8px 24px rgba(28, 39, 51, 0.04); 
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================
   1. Global Reset & Base Styles
   ========================================= */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }
body { background-color: var(--bg-light); color: var(--text-dark); line-height: 1.6; font-size: 15px; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: var(--primary-color); transition: var(--transition); }
a:hover { color: var(--primary-hover); }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
main { min-height: 70vh; padding-bottom: 50px; }
section { padding: 60px 0; }

/* =========================================
   2. Header & Navigation
   ========================================= */
.main-header { background-color: var(--surface-white); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; }
.header-container { display: flex; justify-content: space-between; align-items: center; padding: 18px 20px; }
.logo h2 a { color: var(--secondary-color); font-size: 22px; font-weight: 800; letter-spacing: 0.5px; }
.logo h2 a span { color: var(--primary-color); }

.main-nav ul { list-style: none; display: flex; align-items: center; gap: 30px; }
.main-nav a { color: var(--text-muted); font-weight: 600; font-size: 14px; text-transform: uppercase; letter-spacing: 0.5px; }
.main-nav a:hover, .main-nav a.active { color: var(--primary-color); }

/* =========================================
   3. Buttons & Form Controls
   ========================================= */
.btn { display: inline-block; padding: 12px 28px; border-radius: 6px; font-weight: 600; text-align: center; cursor: pointer; border: none; transition: var(--transition); font-size: 14.5px; letter-spacing: 0.3px; }
.btn-primary { background-color: var(--primary-color); color: var(--surface-white); box-shadow: 0 4px 12px rgba(90, 114, 160, 0.2); }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(90, 114, 160, 0.3); color: var(--surface-white); }
.btn-secondary { background-color: var(--surface-white); color: var(--primary-color); border: 1px solid var(--primary-color); }
.btn-secondary:hover { background-color: var(--primary-color); color: var(--surface-white); }

.form-group { margin-bottom: 22px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--secondary-color); font-size: 14px; }
.form-control { width: 100%; padding: 12px 16px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 15px; transition: var(--transition); background-color: #FAFCFF; color: var(--text-dark); }
.form-control:focus { outline: none; border-color: var(--primary-color); background-color: var(--surface-white); box-shadow: 0 0 0 4px rgba(90, 114, 160, 0.12); }

/* =========================================
   4. Homepage Sections (Hero, Features, Steps)
   ========================================= */
.hero-section { text-align: center; padding: 100px 20px; background: linear-gradient(180deg, var(--surface-white) 0%, var(--bg-light) 100%); border-bottom: 1px solid var(--border-color); }
.hero-section h1 { font-size: 46px; color: var(--secondary-color); margin-bottom: 20px; font-weight: 800; line-height: 1.2; }
.hero-section p { font-size: 18px; color: var(--text-muted); max-width: 700px; margin: 0 auto 35px; }

.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 32px; color: var(--secondary-color); font-weight: 800; margin-bottom: 10px; }

.feature-grid, .steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-card, .step-card { padding: 40px 30px; background: var(--surface-white); border-radius: var(--border-radius); border: 1px solid var(--border-color); text-align: center; transition: var(--transition); }
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--box-shadow); border-color: var(--primary-color); }

/* =========================================
   5. Doctors Directory Cards
   ========================================= */
.doctor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 30px; }
.doctor-card { background: var(--surface-white); padding: 35px; border-radius: var(--border-radius); border: 1px solid var(--border-color); box-shadow: var(--box-shadow); transition: var(--transition); text-align: center; }
.doctor-card:hover { transform: translateY(-8px); border-color: var(--primary-color); }
.doctor-avatar { width: 70px; height: 70px; background-color: var(--accent-light); color: var(--primary-color); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: bold; margin: 0 auto 20px; }

/* =========================================
   6. Auth Pages (Login & Register)
   ========================================= */
.auth-page { display: flex; justify-content: center; align-items: center; min-height: 100vh; padding: 20px; background-color: var(--bg-light); }
.auth-box { width: 100%; max-width: 450px; background: var(--surface-white); padding: 40px; border-radius: var(--border-radius); box-shadow: var(--box-shadow); border: 1px solid var(--border-color); border-top: 5px solid var(--primary-color); }
.auth-box h2 { text-align: center; color: var(--secondary-color); margin-bottom: 25px; font-weight: 700; }
.auth-footer { text-align: center; margin-top: 25px; font-size: 14.5px; color: var(--text-muted); }

/* =========================================
   7. Patient Dashboard Components
   ========================================= */
.patient-dashboard-header { background: var(--surface-white); padding: 20px 0; border-bottom: 1px solid var(--border-color); margin-bottom: 40px; }
.badge { padding: 6px 14px; border-radius: 20px; font-size: 12px; font-weight: 600; display: inline-block; }
.badge.Pending { background: #FFF4E5; color: #B35900; }
.badge.Confirmed { background: var(--success-bg); color: var(--success-color); }
.badge.Cancelled { background: var(--danger-bg); color: var(--danger-color); }

/* =========================================
   8. Shared Alerts
   ========================================= */
.alert { padding: 16px 20px; border-radius: 6px; margin-bottom: 25px; font-weight: 500; text-align: center; font-size: 14.5px; }
.alert-success { background-color: var(--success-bg); color: var(--success-color); border: 1px solid #BFE4E0; }
.alert-danger { background-color: var(--danger-bg); color: var(--danger-color); border: 1px solid #F8CACA; }

/* =========================================
   9. Footer
   ========================================= */
.main-footer { background-color: var(--surface-white); color: var(--text-muted); text-align: center; padding: 40px 20px; border-top: 1px solid var(--border-color); }

/* =========================================
   10. Responsive Media Queries
   ========================================= */
@media screen and (max-width: 768px) {
    .header-container { flex-direction: column; gap: 15px; }
    .main-nav ul { gap: 15px; flex-wrap: wrap; justify-content: center; }
    .hero-section h1 { font-size: 32px; }
    .auth-box { padding: 30px 20px; }
}