/*
File Name: main.css
Relative Location: ./assets/css/main.css
Brief Summary: Main stylesheet for the family photo sharing application with steel blue dark theme.
Initiator Program: All HTML files
Called Files: N/A
Data Files Used: N/A
*/

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

:root {
    /* Color Palette - Steel Blue Dark Theme */
    --primary: #4682B4;         /* Steel Blue */
    --primary-dark: #356395;    /* Darker Steel Blue */
    --primary-light: #6CA0D4;   /* Lighter Steel Blue */
    --accent: #1E90FF;          /* Dodger Blue */
    --text-light: #FFFFFF;      /* White */
    --text-dark: #1A1A2E;       /* Near Black */
    --text-muted: #7A8599;      /* Muted Blue Gray */
    --bg-dark: #1A1A2E;         /* Dark Blue Background */
    --bg-medium: #222442;       /* Medium Dark Blue */
    --bg-light: #2A2A5A;        /* Light Dark Blue */
    --success: #4CAF50;         /* Green */
    --warning: #FF9800;         /* Orange */
    --danger: #F44336;          /* Red */
    --border-radius: 8px;       /* Consistent border radius */
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); /* Consistent shadow */
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-light);
    margin-bottom: 1rem;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-light);
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -10px;
}

.col {
    flex: 1;
    padding: 0 10px;
}

/* Cards and Panels */
.card {
    background-color: var(--bg-medium);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 20px;
    margin-bottom: 20px;
}

.panel {
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 20px;
}

.panel-header {
    background-color: var(--primary);
    color: var(--text-light);
    padding: 15px 20px;
    font-weight: bold;
}

.panel-body {
    padding: 20px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-light);
}

input, select, textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-light);
    border: 1px solid var(--primary-dark);
    border-radius: var(--border-radius);
    color: var(--text-light);
    font-size: 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(30, 144, 255, 0.2);
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary);
    color: var(--text-light);
    border: none;
    border-radius: var(--border-radius);
    padding: 12px 24px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-align: center;
}

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

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

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

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

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

.btn-accent:hover {
    background-color: #0077ea; /* Darker accent */
}

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

.btn-success:hover {
    background-color: #3d8b40; /* Darker success */
}

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

.btn-danger:hover {
    background-color: #d32f2f; /* Darker danger */
}

/* Header & Navigation */
.header {
    background-color: var(--bg-medium);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    margin-bottom: 30px;
}

.nav-buttons {
    display: flex;
    gap: 10px;
}

.nav-btn {
    background-color: var(--bg-light);
    color: var(--text-light);
    border: none;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

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

.nav-btn.active {
    background-color: var(--primary);
    color: var(--text-light);
}

/* Login Container */
.login-container {
    background-color: var(--bg-medium);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 40px;
    max-width: 400px;
    margin: 100px auto;
    text-align: center;
}

.login-container h1 {
    margin-bottom: 30px;
    color: var(--text-light);
}

/* Messages */
.message {
    padding: 12px 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.success-message {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success);
    border-left: 4px solid var(--success);
}

.error-message {
    background-color: rgba(244, 67, 54, 0.1);
    color: var(--danger);
    border-left: 4px solid var(--danger);
}

.info-message {
    background-color: rgba(30, 144, 255, 0.1);
    color: var(--accent);
    border-left: 4px solid var(--accent);
}

/* Loading Indicator */
.loading {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
}

.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive Adjustments */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        padding: 10px;
    }
    
    .header h1 {
        margin-bottom: 10px;
    }
    
    .row {
        flex-direction: column;
    }
    
    .login-container {
        margin: 50px 20px;
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .nav-buttons {
        flex-direction: column;
        gap: 5px;
    }
    
    .btn {
        padding: 10px 16px;
    }
    
    .login-container {
        padding: 20px;
    }
}