:root {
    /* LIGHT MODE (Default) */
    --bg-main: #ffffff;
    --bg-card: #f3f4f6;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --primary: #6366f1; /* Indigo */
    --accent: #8b5cf6;  /* Violet */
    --success: #10b981; /* Green for verify */
    --error: #ef4444;   /* Red for failure */
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --font: 'Space Grotesk', sans-serif;
}

/* DARK MODE Variables */
body.dark-mode {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f3f4f6;
    --text-muted: #94a3b8;
    --primary: #818cf8;
    --accent: #a78bfa;
    --border-color: #334155;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font);
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Navbar */
.navbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 15px 5%; 
    background: var(--bg-main);
    position: sticky; top: 0; z-index: 100;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
}
.logo { font-size: 1.5rem; font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 10px; }
.logo span { color: var(--primary); }

.nav-right { display: flex; align-items: center; gap: 20px; }
.nav-links a { text-decoration: none; color: var(--text-muted); font-weight: 500; transition: 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* Theme Toggle Button */
.theme-btn {
    background: var(--bg-card); border: 1px solid var(--border-color);
    color: var(--text-main); padding: 8px 12px; border-radius: 50px;
    cursor: pointer; transition: 0.3s; display: flex; align-items: center; justify-content: center;
}
.theme-btn:hover { background: var(--border-color); }

/* Hero Section */
.hero {
    text-align: center; padding: 80px 20px 40px;
    position: relative;
}
.hero h1 { font-size: 3rem; line-height: 1.2; margin-bottom: 20px; color: var(--text-main); }
.gradient-text {
    background: linear-gradient(90deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--text-muted); max-width: 600px; margin: 0 auto 30px; font-size: 1.1rem; }

/* Search Box */
.search-container {
    position: relative; max-width: 500px; margin: 0 auto;
}
.search-container input {
    width: 100%; padding: 16px 50px; border-radius: 12px;
    border: 2px solid var(--border-color);
    background: var(--bg-card); color: var(--text-main);
    font-size: 1rem; outline: none; transition: 0.3s;
}
.search-container input:focus { border-color: var(--primary); }
.search-icon { position: absolute; left: 20px; top: 50%; transform: translateY(-50%); color: var(--text-muted); }

/* Tools Grid */
.main-section { padding: 40px 5%; max-width: 1200px; margin: 0 auto; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { color: var(--text-main); }
.underline { width: 50px; height: 4px; background: var(--primary); margin: 10px auto; border-radius: 2px; }

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

/* Card Design */
.tool-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: 0.3s;
    display: flex; flex-direction: column;
    box-shadow: var(--shadow);
}
.tool-card:hover { transform: translateY(-5px); border-color: var(--primary); }

.card-top { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; }

.icon-box {
    width: 55px; height: 55px; background: #ffffff; /* Always white for icons */
    border-radius: 12px; padding: 5px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.tool-img { width: 100%; height: 100%; object-fit: contain; }

.tool-meta h3 { font-size: 1.1rem; color: var(--text-main); margin-bottom: 4px; }
.badge {
    font-size: 0.75rem; background: rgba(99, 102, 241, 0.1); 
    color: var(--primary); padding: 3px 8px; border-radius: 4px; font-weight: 600;
}

.tool-desc {
    color: var(--text-muted); font-size: 0.9rem; line-height: 1.5; margin-bottom: 20px; flex-grow: 1;
}

.unlock-btn {
    width: 100%; padding: 12px; border: none; border-radius: 8px;
    background: var(--primary); color: white; font-weight: 600; cursor: pointer; transition: 0.3s;
}
.unlock-btn:hover { background: var(--accent); }

/* Modal */
.modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6); z-index: 1000; backdrop-filter: blur(5px);
}
.modal-content {
    background: var(--bg-main); width: 95%; max-width: 450px; margin: 10vh auto; padding: 30px;
    border-radius: 20px; border: 1px solid var(--border-color); text-align: center; position: relative;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}
.lock-icon-container {
    width: 60px; height: 60px; background: rgba(99, 102, 241, 0.1); border-radius: 50%;
    display: flex; align-items: center; justify-content: center; margin: 0 auto 15px;
}
.lock-icon-container i { font-size: 24px; color: var(--primary); }
.modal-header h2 { font-size: 1.4rem; color: var(--text-main); margin-bottom: 10px; }
.modal-desc { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 25px; }

/* Offers List */
.offers-list { display: flex; flex-direction: column; gap: 10px; max-height: 400px; overflow-y: auto; padding-right: 5px; }
.offer-item {
    display: flex; align-items: center; background: var(--bg-card); 
    border: 1px solid var(--border-color); padding: 12px; border-radius: 10px; 
    text-decoration: none; color: var(--text-main); transition: 0.2s; text-align: left;
}
.offer-item:hover { border-color: var(--primary); }
.offer-img { width: 40px; height: 40px; border-radius: 8px; margin-right: 12px; object-fit: cover; background: #ddd; }
.offer-info strong { display: block; font-size: 0.9rem; color: var(--text-main); }
.offer-info small { color: var(--text-muted); font-size: 0.75rem; }

/* Verify Button Section */
.verify-section {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}
.verify-btn {
    width: 100%; padding: 12px; border: none; border-radius: 8px;
    background: var(--success); color: white; font-weight: 600; cursor: pointer; transition: 0.3s;
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.verify-btn:hover { opacity: 0.9; }
.verify-btn.error { background: var(--error); } /* للزر في حالة الخطأ */

.close-modal { position: absolute; top: 15px; right: 20px; font-size: 24px; cursor: pointer; color: var(--text-muted); }
.close-modal:hover { color: var(--text-main); }

/* Loader */
.spinner { width: 30px; height: 30px; border: 3px solid var(--border-color); border-top: 3px solid var(--primary); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 10px; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Footer */
footer { text-align: center; padding: 40px 20px; border-top: 1px solid var(--border-color); margin-top: 50px; color: var(--text-muted); }
.footer-links a { color: var(--text-muted); margin: 0 10px; text-decoration: none; font-size: 0.85rem; }
.footer-links a:hover { color: var(--primary); }

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 2.2rem; }
    .grid-container { grid-template-columns: 1fr; }
}