/* ================= GLOBAL VARIABLES ================= */
:root {
    --bg-color: #ffffff;
    --text-color: #111827;
    --text-muted: #6b7280;
    --primary: #2563eb;
    --secondary: #f3f4f6;
    --border: #e5e7eb;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --card-bg: #ffffff;
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --secondary: #1e293b;
    --border: #334155;
    --nav-bg: rgba(15, 23, 42, 0.9);
    --card-bg: #1e293b;
}

/* ================= RESET & BASE ================= */
* {
    margin: 0; padding: 0; box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}
html { scroll-behavior: smooth; }
body {
    background: var(--bg-color); color: var(--text-color);
    line-height: 1.6; transition: background var(--transition), color var(--transition);
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.hidden { display: none !important; }

/* ================= TYPOGRAPHY & BUTTONS ================= */
h1, h2, h3 { color: var(--text-color); margin-bottom: 1rem; }
.btn {
    padding: 0.75rem 1.5rem; border-radius: 8px; border: none; cursor: pointer;
    font-weight: 600; transition: var(--transition); display: inline-block;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { opacity: 0.9; }
.btn-secondary { background: var(--secondary); color: var(--text-color); }
.theme-btn, .admin-login-btn {
    position: fixed; bottom: 20px; right: 20px; background: var(--primary); color: #fff;
    width: 45px; height: 45px; border-radius: 50%; border: none; cursor: pointer;
    z-index: 1000; display: flex; align-items: center; justify-content: center;
}
.admin-login-btn { right: 75px; background: var(--secondary); color: var(--text-color); }

/* ================= NAVBAR ================= */
#navbar {
    position: fixed; top: 0; width: 100%; padding: 1rem 5%;
    background: var(--nav-bg); backdrop-filter: blur(10px); z-index: 100;
    border-bottom: 1px solid var(--border);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a:hover { color: var(--primary); }

/* ================= LAYOUT ================= */
.section { padding: 100px 5%; min-height: 80vh; }
.grid-container {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem;
}

/* ================= HERO ================= */
#hero {
    display: flex; align-items: center; justify-content: space-between; gap: 2rem;
    padding-top: 150px;
}
.hero-content { flex: 1; }
.hero-content h1 { font-size: 4rem; line-height: 1.1; }
.hero-content p { color: var(--text-muted); font-size: 1.2rem; margin-bottom: 2rem; }
.hero-image { flex: 1; text-align: right; }
.hero-image img {
    width: 100%; max-width: 400px; border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

/* ================= CARDS (Projects, Skills) ================= */
.card {
    background: var(--card-bg); padding: 1.5rem; border-radius: 12px;
    border: 1px solid var(--border); transition: var(--transition);
}
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
.card img { width: 100%; border-radius: 8px; margin-bottom: 1rem; }
.tech-tag {
    background: var(--secondary); padding: 0.25rem 0.5rem; border-radius: 4px;
    font-size: 0.8rem; margin-right: 0.5rem; display: inline-block; margin-bottom: 0.5rem;
}

/* ================= FORMS ================= */
form { display: flex; flex-direction: column; gap: 1rem; max-width: 600px; }
input, textarea {
    width: 100%; padding: 1rem; border: 1px solid var(--border);
    background: var(--card-bg); color: var(--text-color); border-radius: 8px;
    outline: none;
}
input:focus, textarea:focus { border-color: var(--primary); }

/* ================= ADMIN PANEL ================= */
#admin-panel { display: flex; min-height: 100vh; background: var(--bg-color); }
.admin-sidebar {
    width: 250px; background: var(--card-bg); padding: 2rem; border-right: 1px solid var(--border);
}
.admin-nav li { margin-bottom: 1rem; }
.admin-nav a { display: block; padding: 0.5rem; border-radius: 6px; }
.admin-nav a:hover { background: var(--secondary); }
.admin-main { flex: 1; padding: 2rem; }
.admin-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.admin-list .card { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.form-container { background: var(--card-bg); padding: 2rem; border-radius: 12px; margin-bottom: 2rem; border: 1px solid var(--border); }

/* ================= MODAL ================= */
.modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 1000;
}
.modal-content {
    background: var(--card-bg); padding: 2rem; border-radius: 12px; width: 90%; max-width: 400px;
    position: relative;
}
.close-btn { position: absolute; top: 15px; right: 15px; cursor: pointer; font-size: 1.5rem; }

/* ================= RESPONSIVE ================= */
@media (max-width: 768px) {
    #hero { flex-direction: column; text-align: center; }
    .hero-image { text-align: center; margin-top: 2rem; }
    .nav-links { display: none; } /* Add hamburger logic in JS if needed */
    #admin-panel { flex-direction: column; }
    .admin-sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
}