:root {
    --bg-main: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --sky-500: #0ea5e9;
    --sky-600: #0284c7;
    --sky-100: #e0f2fe;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-500: #64748b;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --red-500: #ef4444;
    --red-600: #dc2626;
    --emerald-500: #10b981;
    --sky-50: #f0f9ff;
    --sky-100: #e0f2fe;
}

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

a {
    color: inherit;
    text-decoration: none;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--slate-700);
    line-height: 1.5;
}

.text-sky-600 { color: var(--sky-500); }
.text-slate-800 { color: var(--slate-800); }
.text-slate-500 { color: var(--slate-500); }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }

.bg-white { background-color: var(--bg-card); }
.bg-slate-50 { background-color: var(--bg-main); }
.bg-sky-100 { background-color: var(--sky-100); }

.border-b { border-bottom: 1px solid var(--slate-200); }
.border-t { border-top: 1px solid var(--slate-200); }
.border-l-4 { border-left-width: 4px; }
.border-sky-500 { border-color: var(--sky-500); }
.border-slate-200 { border-color: var(--slate-200); }

.shadow-sm { box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05); }
.shadow-md { box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1); }

.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }

.transition-all { transition-property: all; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.duration-200 { transition-duration: 200ms; }

/* Components */
.card {
    background-color: var(--bg-card);
    border-radius: 0.75rem;
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    border: 1px solid var(--slate-200);
    padding: 1.5rem;
    transition: all 200ms ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.btn-primary {
    background-color: var(--sky-600);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background-color 200ms;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background-color: var(--sky-500);
}

.input-field {
    width: 100%;
    padding: 0.5rem 1rem;
    border: 1px solid var(--slate-300);
    border-radius: 0.5rem;
    outline: none;
    transition: ring 200ms;
}

.input-field:focus {
    border-color: var(--sky-500);
    box-shadow: 0 0 0 2px var(--sky-100);
}

/* Brand Logo */
.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--slate-800);
    letter-spacing: -0.025em;
    transition: all 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.brand-logo i {
    color: var(--sky-500);
    font-size: 1.4rem;
}

.brand-logo span .text-accent {
    color: var(--sky-500);
}

.brand-logo:hover {
    transform: scale(1.02);
}

.brand-logo:hover i {
    transform: rotate(-10deg);
}

/* Navigation Links */
.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.925rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--slate-500);
    transition: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
}

.nav-link:hover {
    background-color: var(--sky-50);
    color: var(--sky-600);
    border-color: var(--sky-100);
    transform: translateY(-1px);
}

.nav-link--danger {
    color: var(--slate-500);
}

.nav-link--danger:hover {
    background-color: #fef2f2;
    color: var(--red-600);
    border-color: #fee2e2;
}

.nav-link i {
    font-size: 1rem;
    opacity: 0.8;
}

/* Utils */
.mb-8 { margin-bottom: 2rem; }
.mb-4 { margin-bottom: 1rem; }
.mt-12 { margin-top: 3rem; }
.mr-2 { margin-right: 0.5rem; }
.p-4 { padding: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.max-w-7xl { max-width: 80rem; }
.max-w-md { max-width: 28rem; }
.mx-auto { margin-left: auto; margin-right: auto; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.items-center { align-items: center; }
.text-center { text-align: center; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }

@keyframes pulse-once {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

.animate-pulse-once {
    animation: pulse-once 1s ease-in-out 1;
}