/**
 * Attendance OS — Base Styles
 * Copyright © 2025 Josiah. All rights reserved.
 * Licensed under the MIT License.
 */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    /* Subtle radial gradient behind everything */
    background-image:
        radial-gradient(ellipse 80% 50% at 20% 10%,
            rgba(16, 185, 129, 0.04) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 90%,
            rgba(59, 130, 246, 0.03) 0%, transparent 60%);
    background-attachment: fixed;
}

/* Headings */
h1 {
    font-size: var(--fs-2xl);
    font-weight: 700;
    letter-spacing: -0.03em;
}

h2 {
    font-size: var(--fs-xl);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: var(--fs-lg);
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: var(--space-sm);
}

h4 {
    font-size: var(--fs-md);
    font-weight: 600;
}

h2,
h3,
h4 {
    color: var(--text-primary);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-light);
}

/* Form controls — glass style */
input,
select,
textarea {
    background: var(--glass-2);
    -webkit-backdrop-filter: var(--blur-sm);
    backdrop-filter: var(--blur-sm);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--fs-md);
    width: 100%;
    min-height: 44px;
    transition: var(--transition-fast);
    outline: none;
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--border-accent);
    background: var(--glass-3);
    box-shadow: 0 0 0 3px var(--primary-glow-sm),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

select option {
    background: #0a1628;
    color: var(--text-primary);
}

label {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

/* Prevent tap highlight on mobile */
button,
.nav-item,
a {
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-bright);
}

/* Icon containers */
.icon-chart,
.icon-moon,
.icon-sun,
.icon-book,
.icon-clipboard,
.icon-edit,
.icon-camera,
.icon-crystal,
.icon-calendar,
.icon-trend-up,
.icon-trend-down,
.icon-arrow-right,
.icon-clock,
.icon-trash,
.icon-party,
.icon-check,
.icon-x,
.icon-progress {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}