/* Import Google Fonts */
/* @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&family=Material+Icons&display=swap'); */

/* CSS Variables for Material UI Colors */
:root {
    --primary-teal: #00796B;
    --primary-teal-dark: #004D40;
    --primary-teal-light: #00A892;
    --primary-teal-lighter: #B2DFDB;
    --white: #FFFFFF;
    --text-primary: #212121;
    --text-secondary: #757575;
    --bg-light: #FAFAFA;
    --border-light: #EEEEEE;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s ease;
}

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

html, body {
    height: 100%;
}

body {
    /* font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; */
    background: url('https://images.unsplash.com/photo-1557672172-298e090d0f80?q=80&w=2070&auto=format&fit=crop') no-repeat center center fixed;
    background-size: cover;
    background-attachment: fixed;
    position: relative;
    min-height: 100vh;
    color: var(--text-primary);
}

/* Dark Overlay with Material Design */
.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 121, 107, 0.3) 0%, rgba(0, 77, 64, 0.2) 100%);
    backdrop-filter: blur(3px);
    z-index: -1;
}

/* Registration Card - Material Design */
.registration-card {
    border: none;
    border-radius: 12px;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    animation: slideInUp 0.5s cubic-bezier(0.35, 0, 0.25, 1);
    overflow: hidden;
    position: relative;
    transition: box-shadow var(--transition-normal);
}

.registration-card:hover {
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.2);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Top Accent Border */
.registration-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-teal) 0%, var(--primary-teal-light) 100%);
}

/* Card Title - Material Typography */
.card-title {
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0px;
    line-height: 1.3;
}

/* Card Subtitle */
.card-body .text-center.text-muted {
    color: var(--text-secondary) !important;
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.3px;
}

/* Form Inputs - Material Design */
.form-control {
    border: 2px solid var(--border-light);
    border-right: none;
    padding: 12px 16px;
    font-size: 0.95rem;
    font-weight: 400;
    background-color: var(--white);
    color: var(--text-primary);
    border-radius: 6px 0 0 6px;
    transition: all var(--transition-fast);
    /* font-family: 'Roboto', sans-serif; */
}

.form-control::placeholder {
    color: var(--text-secondary);
    font-weight: 400;
    opacity: 0.7;
}

.form-control:focus {
    box-shadow: none;
    border-color: var(--primary-teal);
    background-color: rgba(0, 121, 107, 0.02);
    color: var(--text-primary);
}

.form-control:hover:not(:focus) {
    border-color: rgba(0, 121, 107, 0.5);
}

/* Input Group - Material Design */
.input-group {
    position: relative;
}

.input-group-text {
    border: 2px solid var(--border-light);
    border-left: none;
    padding: 12px 16px;
    background-color: var(--white);
    border-radius: 0 6px 6px 0;
    transition: all var(--transition-fast);
}

.input-group:focus-within .input-group-text {
    border-color: var(--primary-teal);
    background-color: rgba(0, 121, 107, 0.02);
}

.input-group:focus-within .form-control {
    border-color: var(--primary-teal);
}

/* Icons */
.text-primary-teal {
    color: var(--primary-teal) !important;
    transition: color var(--transition-fast);
}

.input-group:hover .text-primary-teal {
    color: var(--primary-teal-light) !important;
}

.input-group:focus-within .text-primary-teal {
    color: var(--primary-teal-dark) !important;
}

/* Register Button - Enhanced Material Design */
.btn-register {
    background: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-teal-light) 100%);
    border: none;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--white);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-register::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left var(--transition-normal);
    z-index: 0;
}

.btn-register:hover {
    background: linear-gradient(135deg, var(--primary-teal-dark) 0%, var(--primary-teal) 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 121, 107, 0.35);
    color: var(--white);
    text-decoration: none;
}

.btn-register:hover::before {
    left: 100%;
}

.btn-register:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 121, 107, 0.25);
}

.btn-register:disabled {
    background: #BDBDBD;
    box-shadow: var(--shadow-sm);
    cursor: not-allowed;
    transform: none;
}

.button-text {
    position: relative;
    z-index: 1;
}

.button-icon {
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
    transition: transform var(--transition-normal);
}

.btn-register:hover .button-icon {
    transform: translateX(4px);
}

/* Login Link - Material Design */
.login-link {
    color: var(--primary-teal);
    font-weight: 600;
    transition: all var(--transition-fast);
    position: relative;
}

.login-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-teal);
    transition: width var(--transition-normal);
}

.login-link:hover {
    color: var(--primary-teal-dark);
    text-decoration: none;
}

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

/* Text Utilities */
.text-muted {
    color: var(--text-secondary) !important;
}

/* Responsive Design - Material Mobile-First */
@media (max-width: 768px) {
    .card-title {
        font-size: 1.5rem;
        margin-bottom: 0.5rem !important;
    }

    .registration-card {
        margin: 1rem;
        border-radius: 12px;
    }

    .card-body {
        padding: 2rem !important;
    }

    .btn-register {
        padding: 12px 20px;
        font-size: 0.95rem;
        letter-spacing: 0.5px;
    }

    .button-icon {
        font-size: 0.85rem;
    }
}

@media (max-width: 576px) {
    .card-title {
        font-size: 1.3rem;
    }

    .form-control,
    .input-group-text {
        padding: 10px 14px;
        font-size: 0.9rem;
    }

    .btn-register {
        padding: 11px 18px;
        font-size: 0.9rem;
        letter-spacing: 0.3px;
    }

    .registration-card {
        margin: 0.75rem;
    }

    .card-body {
        padding: 1.5rem !important;
    }
}

/* Form Control Validation States */
.form-control:valid:focus {
    border-color: #4CAF50;
    background-color: rgba(76, 175, 80, 0.02);
}

.form-control:invalid:focus {
    border-color: #F44336;
    background-color: rgba(244, 67, 54, 0.02);
}

/* Margin Utilities */
.mb-3 {
    margin-bottom: 1.25rem;
}

.mb-4 {
    margin-bottom: 1.75rem;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-0 {
    margin-bottom: 0;
}

/* Container & Layout */
.container {
    max-width: 1200px;
    padding: 0 1rem;
}

/* Animation for form fields */
.form-control,
.input-group-text {
    animation: fadeInUp 0.5s cubic-bezier(0.35, 0, 0.25, 1) backwards;
}

.mb-3:nth-child(1) { animation-delay: 0.1s; }
.mb-3:nth-child(2) { animation-delay: 0.2s; }
.mb-3:nth-child(3) { animation-delay: 0.3s; }
.mb-4 { animation-delay: 0.4s; }
.d-grid { animation-delay: 0.5s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Utility Classes */
.fw-semibold {
    font-weight: 600;
}

.fw-bold {
    font-weight: 700;
}

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

.text-decoration-none {
    text-decoration: none !important;
}

.w-100 {
    width: 100%;
}

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

.d-flex {
    display: flex;
}

.d-grid {
    display: grid;
}

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

.justify-content-center {
    justify-content: center;
}

.shadow-lg {
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15) !important;
}

.p-4 {
    padding: 1.5rem;
}

.p-md-5 {
    padding: 3rem;
}