/* ===================================================================
   1. :root VARIABLES
=================================================================== */
:root {
    /* Colors */
    --primary-color: #007bff;
    --secondary-color: #28a745;
    --header-bg: #2c3e50;
    --card-bg: #ffffff;
    --body-bg: #f0f2f5;
    --warning-bg: #ffc107;
    --button-cyan: #00bcd4;
    --dark-text: #333;
    --light-text: #f8f9fa;
    --subtle-text: #6c757d;
    --border-color: #dee2e6;
    --locked-bg: #e9ecef; /* New color for locked tasks */
    --locked-border: #adb5bd; /* New border for locked tasks */

    /* Fonts */
    --font-family-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --base-font-size: 16px;

    /* Spacing */
    --spacing-small: 8px;
    --spacing-medium: 16px;
    --spacing-large: 32px;

    /* Effects */
    --box-shadow-light: 0 4px 8px rgba(0, 0, 0, 0.05);
    --box-shadow-heavy: 0 8px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
}


/* ===================================================================
   2. GENERAL & RESET STYLES
=================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-main);
    font-size: var(--base-font-size);
    margin: 0;
    padding: 0;
    background-color: var(--body-bg);
    color: var(--dark-text);
    line-height: 1.6;
}

h1, h2, h3 {
    color: var(--header-bg);
    margin-top: 0;
    margin-bottom: var(--spacing-medium);
}

p {
    margin-top: 0;
    margin-bottom: var(--spacing-medium);
}

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

a:hover {
    color: #0056b3;
}


/* ===================================================================
   3. LAYOUT & STRUCTURE
=================================================================== */

/* --- Header --- */
header {
    background-color: var(--header-bg);
    color: var(--light-text);
    padding: var(--spacing-medium) var(--spacing-medium);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header h1 {
    font-size: 1.2em;
    color: var(--light-text);
    margin: 0;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-medium);
}

#userInfo {
    display: none;
    flex-direction: column;
    align-items: flex-end;
}

#userEmailDisplay {
    font-size: 0.8em;
    color: #bdc3c7;
    margin: 0;
}

#walletIconContainer {
    display: flex;
    align-items: center;
    gap: var(--spacing-small);
    padding: 5px 10px;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
}

#walletIconContainer i {
    color: var(--warning-bg);
}

#coinsBalanceDisplay {
    font-weight: bold;
    color: var(--light-text);
}

#profileIconButton {
    background: none;
    border: 2px solid var(--light-text);
    color: var(--light-text);
    font-size: 20px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

#profileIconButton:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* --- Main Container & Sections --- */
.container, .auth-container {
    width: 95%;
    max-width: 1200px;
    margin: var(--spacing-large) auto;
    padding: 0;
}

section {
    display: none;
    background-color: var(--card-bg);
    padding: var(--spacing-large);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-heavy);
}

.back-link {
    display: inline-block;
    margin-bottom: var(--spacing-medium);
    font-weight: bold;
}


/* ===================================================================
   4. COMPONENTS
=================================================================== */

/* --- Category List --- */
.category-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-medium);
}

.category-btn {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-large);
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: var(--box-shadow-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-small);
}

.category-btn:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-heavy);
    border-color: var(--primary-color);
}

.category-btn i {
    font-size: 36px;
    margin-bottom: var(--spacing-small);
}

.category-btn span {
    font-weight: bold;
    font-size: 1.1em;
    color: var(--dark-text);
}

/* --- Task List & Cards --- */
#taskList {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-large);
}

.task-card {
    background-color: #333;
    padding: var(--spacing-large);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    text-align: center;
    color: var(--light-text);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, opacity 0.3s ease;
    position: relative; 
}

.task-card:hover:not([style*="opacity: 0.6"]) {
    transform: scale(1.02);
}

.task-title {
    font-size: 1.3em;
    font-weight: bold;
    color: var(--light-text);
}

.task-platform {
    color: #bdc3c7;
    margin-bottom: var(--spacing-medium);
}

.warning-box {
    background-color: rgba(255, 193, 7, 0.1);
    color: var(--light-text);
    padding: var(--spacing-medium);
    border-radius: 8px;
    border-left: 5px solid var(--warning-bg);
    margin-bottom: var(--spacing-medium);
    text-align: right;
    direction: rtl;
    flex-grow: 1;
}

.earn-button {
    background: var(--button-cyan);
    color: var(--dark-text);
    border: none;
    padding: var(--spacing-medium) var(--spacing-large);
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(0, 188, 212, 0.5);
    width: 100%;
    transition: all 0.3s ease;
    margin-top: auto;
    
    display: flex; 
    align-items: center; 
    justify-content: center;
}

.earn-button:hover:not(:disabled) {
    background: #00e0e0;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.8);
    transform: scale(1.05);
}

/* --- TASK LOCK SPECIFIC STYLES --- */
.lock-icon {
    margin-left: 8px;
    font-size: 1.2em;
    color: #ff4d4d;
}

.task-card[style*="opacity: 0.6"] {
    cursor: not-allowed;
    background-color: var(--locked-bg);
    border: 1px solid var(--locked-border);
    color: var(--subtle-text);
    box-shadow: none;
}

.task-card[style*="opacity: 0.6"] .task-title,
.task-card[style*="opacity: 0.6"] .task-platform {
    color: var(--subtle-text);
}

.earn-button:disabled {
    background: var(--locked-border);
    color: var(--dark-text);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}
/* --- END TASK LOCK SPECIFIC STYLES --- */


/* --- Auth Modal & Signup Page --- */
.modal { display: none; position: fixed; z-index: 1001; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.7); backdrop-filter: blur(5px); justify-content: center; align-items: center; }
.modal-content { background-color: var(--card-bg); padding: var(--spacing-large); border-radius: var(--border-radius); width: 90%; max-width: 400px; box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); position: relative; }
.close-btn { color: var(--subtle-text); position: absolute; top: var(--spacing-medium); right: var(--spacing-large); font-size: 30px; font-weight: bold; cursor: pointer; }
.auth-form input { border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: var(--spacing-medium); padding: 14px; width: 100%; font-size: 1em; }
.auth-form input:focus { border-color: var(--primary-color); outline: none; box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25); }
.auth-form button { background-color: var(--secondary-color); color: white; padding: 14px; border: none; border-radius: 8px; width: 100%; cursor: pointer; font-size: 1.1em; font-weight: bold; transition: background-color 0.3s; }
.auth-form button:hover { background-color: #218838; }
.auth-toggle { margin-top: var(--spacing-large); }
#message { margin-top: var(--spacing-medium); font-weight: bold; color: #dc3545; }

/* --- Success Popup --- */
#successPopup { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background-color: var(--secondary-color); color: white; padding: var(--spacing-large); border-radius: var(--border-radius); z-index: 10000; box-shadow: 0 0 20px rgba(40, 167, 69, 0.8); font-weight: bold; font-size: 1.2em; display: none; text-align: center; }


/* ===================================================================
   6. RESPONSIVE DESIGN (Media Queries)
=================================================================== */

/* --- 6.1 TABLET VIEW --- */
@media (min-width: 768px) {
    header h1 {
        font-size: 1.5em;
    }

    .category-list {
        grid-template-columns: repeat(2, 1fr);
    }

    #taskList {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* --- 6.2 DESKTOP VIEW --- */
@media (min-width: 1024px) {
    .category-list {
        grid-template-columns: repeat(3, 1fr);
    }

    #taskList {
        grid-template-columns: repeat(3, 1fr);
    }

    section {
        padding: 40px;
    }
}