/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
    --bg-primary: #f0fdf4;
    --bg-card: rgba(255, 255, 255, 0.88);
    --border-color: rgba(209, 250, 229, 0.8);
    --text-main: #064e3b;
    --text-muted: #475569;
    --primary-color: #10b981;
    --primary-hover: #059669;
    --accent-success: #059669;
    --accent-danger: #ef4444;
    --accent-warning: #f59e0b;
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --shadow-soft: 0 10px 30px -5px rgba(6, 78, 59, 0.05), 0 5px 15px -5px rgba(6, 78, 59, 0.03);
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.15);
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    background-attachment: fixed;
    color: var(--text-main);
    font-size: 16px;
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 80px; /* Space for sticky floating button */
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
}

/* Container limits to phone width for mobile-first viewport */
.app-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 15px;
    position: relative;
}

/* Glassmorphic Cards */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 20px;
    overflow: hidden;
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px -5px rgba(6, 78, 59, 0.07), 0 5px 20px -5px rgba(16, 185, 129, 0.05);
}

/* Large Accessible Forms */
.form-control-lg, .form-select-lg {
    font-size: 16px;
    height: 52px;
    border-radius: 12px;
    border: 1.5px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--text-main);
    font-weight: 500;
    transition: all 0.2s ease;
}

.form-control-lg:focus, .form-select-lg:focus {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
    background-color: #fff;
}

/* Large Interactive Buttons */
.btn-lg-custom {
    min-height: 50px;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 14px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
}

.btn-primary-custom {
    background: linear-gradient(135deg, #10b981 0%, #047857 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.2);
}

.btn-primary-custom:active {
    transform: scale(0.98);
    background: linear-gradient(135deg, #059669 0%, #065f46 100%);
}

.btn-secondary-custom {
    background: #fff;
    color: var(--text-main);
    border: 1.5px solid var(--border-color);
}

.btn-secondary-custom:active {
    background: #f8fafc;
    transform: scale(0.98);
}

/* Plus Minus Counters */
.counter-btn {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
}

.counter-btn-plus {
    background-color: var(--accent-success);
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.2);
}

.counter-btn-plus:active {
    transform: scale(0.9);
}

.counter-btn-minus {
    background-color: var(--accent-danger);
    box-shadow: 0 4px 10px rgba(239, 68, 68, 0.2);
}

.counter-btn-minus:active {
    transform: scale(0.9);
}

.counter-value {
    font-size: 22px;
    font-weight: 700;
    width: 50px;
    text-align: center;
}

/* Floating Bottom Sticky Bar */
.floating-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-color);
    padding: 12px 0;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.05);
}

.floating-bar .container-fluid {
    max-width: 500px;
    padding: 0 15px;
}

/* Student Cards List */
.student-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 14px;
    margin-bottom: 12px;
    transition: all 0.2s ease;
}

.student-card:active {
    background-color: #f8fafc;
}

.student-card.absent {
    border-left: 5px solid var(--accent-danger);
    background-color: #fff5f5;
}

.student-card .student-name {
    font-weight: 600;
    font-size: 16px;
    color: var(--text-main);
    margin-bottom: 4px;
}

.student-card .student-nis {
    font-size: 12px;
    color: var(--text-muted);
}

/* Checkbox Style for Attendance (Big & Touch Friendly) */
.attendance-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 28px;
    height: 28px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background-color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.attendance-checkbox:checked {
    background-color: var(--accent-danger);
    border-color: var(--accent-danger);
}

.attendance-checkbox:checked::after {
    content: "✗";
    color: white;
    font-size: 16px;
    font-weight: bold;
}

/* Quick Input Presets for Grades */
.grade-preset-btn {
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: #f1f5f9;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.15s ease;
}

.grade-preset-btn:active {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* Custom styled inputs for grades */
.grade-input {
    width: 70px;
    height: 44px;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
    border-radius: 8px;
    border: 1.5px solid var(--border-color);
}

.grade-input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

/* Pulse Animation for active/unsaved buttons */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.pulse-button {
    animation: pulse 2s infinite ease-in-out;
}