/* ========== RESET & GLOBAL ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1f2937;
    --darker: #111827;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
    --white: #ffffff;
    --border-radius: 16px;
    --box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    background-attachment: fixed;
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

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

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in-left {
    animation: slideInLeft 0.8s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.8s ease-out;
}

.scale-in {
    animation: scaleIn 0.5s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

.float {
    animation: float 3s ease-in-out infinite;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: 700;
    line-height: 1.2;
    color: var(--dark);
    -webkit-font-smoothing: antialiased;
}

h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

p {
    margin-bottom: 1rem;
    color: var(--gray);
    font-size: 1.05rem;
    line-height: 1.8;
}

/* ========== HEADER ========== */
header {
    background: var(--white);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 18px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    font-size: 36px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(90deg, var(--dark), #4b5563);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.logo-text span {
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav a {
    text-decoration: none;
    color: var(--gray);
    font-weight: 600;
    font-size: 16px;
    padding: 8px 16px;
    border-radius: 10px;
    transition: all 0.3s ease;
    position: relative;
    letter-spacing: 0.2px;
}

nav a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: 3px;
    transition: width 0.3s ease;
}

nav a:hover::before {
    width: 80%;
}

nav a:hover, nav a.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

nav a.btn-login {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 12px 32px;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
    border-radius: 12px;
}

nav a.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

nav a.btn-login:hover::before {
    left: 100%;
}

nav a.btn-login:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.4);
}

/* ========== AUTH PAGE ========== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    position: relative;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.05) 0%, transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(16, 185, 129, 0.05) 0%, transparent 30%);
    z-index: -1;
}

.auth-box {
    background: var(--white);
    backdrop-filter: blur(20px);
    padding: 60px 50px;
    border-radius: var(--border-radius);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 500px;
    margin: 20px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.auth-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 0%,
        rgba(99, 102, 241, 0.03) 25%,
        transparent 50%,
        rgba(16, 185, 129, 0.03) 75%,
        transparent 100%
    );
    animation: float 3s ease infinite;
    z-index: -1;
}

.auth-box h2 {
    text-align: center;
    margin-bottom: 35px;
    color: var(--dark);
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    position: relative;
}

.auth-box h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: 2px;
}

.auth-box p {
    text-align: center;
    margin-bottom: 35px;
    color: var(--gray);
    font-size: 1.1rem;
    font-weight: 400;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark);
    font-size: 15px;
    letter-spacing: 0.2px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 15px;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    transition: all 0.3s ease;
    background: var(--white);
    color: var(--dark);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    background: var(--white);
}

.form-group input::placeholder {
    color: #9ca3af;
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 17px;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.btn-submit:hover::before {
    left: 100%;
}

.btn-submit:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-submit:active {
    transform: translateY(1px);
}

.auth-link {
    text-align: center;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.auth-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    padding: 5px 10px;
    border-radius: 8px;
}

.auth-link a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    transition: width 0.3s ease;
}

.auth-link a:hover::after {
    width: 100%;
}

.auth-link a:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--primary-dark);
}

/* ========== DASHBOARD ========== */
.dashboard {
    min-height: 100vh;
    padding: 100px 0 60px;
}

.dashboard-header {
    background: var(--white);
    backdrop-filter: blur(20px);
    padding: 50px;
    border-radius: var(--border-radius);
    margin-bottom: 40px;
    box-shadow: var(--box-shadow);
    border: 1px solid rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.dashboard-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark), var(--secondary));
}

.dashboard-header h1 {
    font-size: 3rem;
    margin-bottom: 15px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.dashboard-header p {
    color: var(--gray);
    font-size: 1.2rem;
    font-weight: 400;
    max-width: 700px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.user-avatar {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 28px;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
    border: 3px solid var(--white);
}

/* ========== CARD ========== */
.card {
    background: var(--white);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.18);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid rgba(0, 0, 0, 0.08);
}

.card-header h2 {
    font-size: 2rem;
    color: var(--dark);
    margin: 0;
}

.card-header a {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
    font-size: 16px;
    letter-spacing: 0.3px;
}

.card-header a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

/* ========== TABLE ========== */
.table-responsive {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
}

table th {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 18px 20px;
    text-align: left;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    font-size: 16px;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
}

table td {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    color: var(--dark);
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    font-size: 15px;
    transition: background 0.2s ease;
}

table tr:last-child td {
    border-bottom: none;
}

table tr:hover td {
    background: rgba(99, 102, 241, 0.05);
    color: var(--dark);
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    text-transform: capitalize;
    letter-spacing: 0.3px;
}

.badge-dasar {
    background: rgba(219, 234, 254, 0.8);
    color: #1e40af;
    border: 1px solid #93c5fd;
}

.badge-menengah {
    background: rgba(254, 243, 199, 0.8);
    color: #b45309;
    border: 1px solid #fcd34d;
}

.badge-lanjutan {
    background: rgba(220, 252, 231, 0.8);
    color: #15803d;
    border: 1px solid #86efac;
}

.action-links a {
    margin-right: 12px;
    text-decoration: none;
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    transition: all 0.3s ease;
    display: inline-block;
    letter-spacing: 0.2px;
}

.action-links a.edit {
    background: rgba(219, 234, 254, 0.8);
    color: #1e40af;
    border: 1px solid #93c5fd;
}

.action-links a.delete {
    background: rgba(254, 242, 242, 0.8);
    color: #b91c1c;
    border: 1px solid #fca5a5;
}

.action-links a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* ========== ALERT ========== */
.alert {
    padding: 18px 25px;
    border-radius: 12px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.3px;
    border-left-width: 4px;
    border-left-style: solid;
    animation: slideInRight 0.6s ease-out;
}

.alert-success {
    background: rgba(220, 252, 231, 0.8);
    color: #15803d;
    border-left-color: #22c55e;
}

.alert-error {
    background: rgba(254, 242, 242, 0.8);
    color: #b91c1c;
    border-left-color: #ef4444;
}

.alert-info {
    background: rgba(219, 234, 254, 0.8);
    color: #1e40af;
    border-left-color: #3b82f6;
}

/* ========== KELAS CARD ========== */
.kelas-card {
    background: var(--white);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--box-shadow);
    border: 1px solid rgba(0, 0, 0, 0.08);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.kelas-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark), var(--secondary));
}

.kelas-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
}

/* ========== IMAGE PREVIEW ========== */
img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    transition: transform 0.3s ease;
    border: 2px solid rgba(0, 0, 0, 0.05);
}

img:hover {
    transform: scale(1.05);
    border-color: var(--primary);
}

/* ========== UPLOAD FILE STYLE ========== */
input[type="file"] {
    background: var(--white);
    border: 2px dashed #d1d5db;
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    color: var(--gray);
}

input[type="file"]:hover {
    background: #f9fafb;
    border-color: var(--primary);
    transform: translateY(-2px);
}

input[type="file"]::-webkit-file-upload-button {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    font-weight: 700;
    transition: all 0.3s ease;
}

input[type="file"]::-webkit-file-upload-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* ========== FOOTER ========== */
footer {
    background: var(--white);
    backdrop-filter: blur(20px);
    padding: 40px 0;
    text-align: center;
    margin-top: 60px;
    box-shadow: 0 -5px 25px rgba(0, 0, 0, 0.06);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark), var(--secondary));
}

footer p {
    color: var(--gray);
    font-size: 15px;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    letter-spacing: 0.3px;
}

/* ========== BUTTON GROUP ========== */
.btn-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

.btn-group a,
.btn-group button {
    flex: 1;
    text-align: center;
    padding: 14px;
    border-radius: 12px;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 16px;
    letter-spacing: 0.3px;
}

.btn-group a.secondary,
.btn-group button.secondary {
    background: var(--light-gray);
    color: var(--dark);
}

.btn-group a.secondary:hover,
.btn-group button.secondary:hover {
    background: #e5e7eb;
    transform: translateY(-2px);
}

/* ========== LANDING PAGE INDEX ========== */
.hero-section {
    background: linear-gradient(135deg, var(--white) 0%, #f9fafb 100%);
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: float 3s ease-in-out infinite;
}

.hero-content p {
    font-size: 1.5rem;
    color: var(--gray);
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 30px;
}

.hero-buttons a {
    padding: 16px 40px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 17px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.hero-buttons a.primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
}

.hero-buttons a.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.hero-buttons a.secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.hero-buttons a.secondary:hover {
    background: rgba(99, 102, 241, 0.08);
    transform: translateY(-3px);
}

.features-section {
    padding: 80px 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: var(--box-shadow);
    border: 1px solid rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.18);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-card h3 {
    font-size: 1.75rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    font-size: 1.05rem;
}

/* ========== IPHONE & MOBILE OPTIMIZATION ========== */
@media (max-width: 768px) {
    /* Header adjustments */
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
    }
    
    nav a {
        font-size: 14px;
        padding: 6px 12px;
    }
    
    .logo-text {
        font-size: 22px;
    }
    
    .logo-icon {
        font-size: 28px;
    }
    
    /* Hero section */
    .hero-section {
        padding: 60px 0 40px;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .hero-buttons a {
        width: 100%;
        max-width: 320px;
        padding: 14px;
        font-size: 16px;
    }
    
    /* Card adjustments */
    .card {
        padding: 25px 20px;
    }
    
    .card-header {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
    }
    
    .card-header a {
        width: 100%;
        text-align: center;
        padding: 12px;
        font-size: 15px;
    }
    
    /* Table responsive */
    .table-responsive {
        margin: 0 -15px;
        border-radius: 0;
    }
    
    table {
        font-size: 14px;
    }
    
    table th,
    table td {
        padding: 12px 15px;
    }
    
    /* Kelas card grid */
    .kelas-card {
        padding: 20px;
    }
    
    /* Features grid */
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: 25px 20px;
    }
    
    /* Auth box */
    .auth-box {
        padding: 35px 25px;
        margin: 10px;
    }
    
    .auth-box h2 {
        font-size: 1.8rem;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 12px 15px;
        font-size: 15px;
    }
    
    .btn-submit {
        padding: 14px;
        font-size: 16px;
    }
    
    /* Dashboard header */
    .dashboard-header {
        padding: 30px 20px;
    }
    
    .dashboard-header h1 {
        font-size: 2rem;
    }
    
    /* User info */
    .user-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .user-avatar {
        width: 55px;
        height: 55px;
        font-size: 22px;
    }
    
    /* Stats section */
    section[style*="padding: 60px"] {
        padding: 40px 0;
    }
}

@media (max-width: 480px) {
    /* iPhone SE, iPhone 5/SE size */
    .logo-text {
        font-size: 18px;
    }
    
    .logo-icon {
        font-size: 24px;
    }
    
    nav ul {
        gap: 5px;
    }
    
    nav a {
        font-size: 13px;
        padding: 5px 10px;
    }
    
    h1 {
        font-size: 1.8rem !important;
    }
    
    h2 {
        font-size: 1.5rem !important;
    }
    
    h3 {
        font-size: 1.3rem !important;
    }
    
    p {
        font-size: 0.95rem;
    }
    
    .auth-box {
        padding: 25px 20px;
    }
    
    .btn-submit {
        padding: 12px;
        font-size: 15px;
    }
    
    .kelas-card {
        padding: 18px;
    }
    
    .feature-card {
        padding: 20px 15px;
    }
    
    /* Hide some columns on very small screens */
    table th:nth-child(n+6),
    table td:nth-child(n+6) {
        display: none;
    }
}

/* Touch-friendly buttons for iPhone */
@media (hover: none) and (pointer: coarse) {
    a, button, .btn-submit, nav a {
        min-height: 44px;
        min-width: 44px;
        padding: 12px 20px !important;
    }
    
    .action-links a {
        min-height: 40px;
        padding: 10px 15px !important;
    }
}