/* ========================================
   MAIN.CSS - Global Styles & Variables
   ======================================== */

/* CSS Variables for Theme Colors */
:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #BBDEFB;
    --secondary-color: #FF4081;
    --background-color: #F5F7FA;
    --surface-color: #FFFFFF;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #E0E0E0;
    --success-color: #4CAF50;
    --error-color: #F44336;
    --warning-color: #FF9800;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

/* Dark Mode Variables */
body.dark-mode {
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --border-color: #333333;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    transition: var(--transition);
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

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

/* ========================================
   INITIAL LOADER
   ======================================== */
.initial-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.initial-loader.hide {
    opacity: 0;
    visibility: hidden;
}

.spinner-container {
    text-align: center;
    color: #FFFFFF;
}

.spinner-container .spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 4px;
}

.loader-text {
    color: #FFFFFF;
    font-size: 1.1rem;
    font-weight: 500;
    margin-top: 1rem;
}

/* ========================================
   CONTENT LOADER
   ======================================== */
.content-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--background-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 999;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.content-loader.hide {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* ========================================
   HEADER
   ======================================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 100;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-logo {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.header-brand {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1.3rem;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-icon-btn:hover {
    background: var(--background-color);
    color: var(--primary-color);
}

.header-icon-btn:active {
    transform: scale(0.95);
}

/* ========================================
   MAIN CONTENT AREA
   ======================================== */
.main-content {
    margin-top: 60px;
    margin-bottom: 70px;
    min-height: calc(100vh - 130px);
    padding: 1rem;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

/* Section Header */
.section-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.section-header h4 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.section-header h5 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.back-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--background-color);
    color: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.5rem;
}

.back-btn:hover {
    background: var(--border-color);
}

.back-btn:active {
    transform: scale(0.95);
}

/* ========================================
   BOTTOM NAVIGATION
   ======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    padding: 0.5rem 0;
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    padding: 0.5rem;
}

.nav-item i {
    font-size: 1.4rem;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item:active {
    transform: scale(0.95);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.d-none {
    display: none !important;
}

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

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Card Styles */
.card {
    background: var(--surface-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

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

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

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--text-secondary);
    color: #FFFFFF;
}

.btn-danger {
    background: var(--error-color);
    color: #FFFFFF;
}

.btn-danger:hover {
    background: #D32F2F;
}

/* Form Controls */
.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

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

.input-group {
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background: var(--surface-color);
    transition: var(--transition);
}

.input-group:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.input-group-text {
    padding: 0.75rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
}

.input-group .form-control {
    border: none;
    box-shadow: none;
}

/* Modal Styles */
.modal-content {
    background: var(--surface-color);
    border-radius: 16px;
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem;
}

.modal-title {
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

.btn-close {
    background-color: transparent;
    border: none;
    opacity: 0.5;
}

.btn-close:hover {
    opacity: 1;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    .header-brand {
        font-size: 1.1rem;
    }
    
    .section-header h4 {
        font-size: 1.2rem;
    }
    
    .container {
        padding: 0 0.75rem;
    }
}

@media (max-width: 480px) {
    .header-logo {
        font-size: 1.5rem;
    }
    
    .header-brand {
        font-size: 1rem;
    }
    
    .nav-item i {
        font-size: 1.2rem;
    }
    
    .nav-item span {
        font-size: 0.7rem;
    }
}

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Loading Animation */
.loading-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}