:root {
    /* Color Palette */
    --primary: #2563eb;
    /* Royal Blue */
    --primary-hover: #1d4ed8;
    --secondary: #f8fafc;
    /* Slate 50 */
    --text-main: #1e293b;
    /* Slate 800 */
    --text-light: #64748b;
    /* Slate 500 */
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --surface: #ffffff;

    /* Spacing & Borders */
    --radius: 0.5rem;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--secondary);
    color: var(--text-main);
    margin: 0;
    line-height: 1.6;
}

h1,
h2,
h3 {
    margin-top: 0;
    color: var(--text-main);
}

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

a:hover {
    text-decoration: underline;
}

/* Layout Containers */
.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Cards */
.card {
    background: var(--surface);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

/* Buttons */
.btn,
button {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    background-color: var(--primary);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    text-align: center;
    text-decoration: none;
}

.btn:hover,
button:hover {
    background-color: var(--primary-hover);
    text-decoration: none;
}

.btn:active,
button:active {
    transform: translateY(1px);
}

.btn-secondary {
    background-color: var(--surface);
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary:hover {
    background-color: #eff6ff;
}

.btn-danger,
.btn-logout {
    background-color: var(--danger);
    color: white;
}

.btn-danger:hover,
.btn-logout:hover {
    background-color: #dc2626;
}

.btn-process {
    background-color: var(--success);
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.9em;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 1.5rem;
}

/* Page Loader & Transitions */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.page-loader.active {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(59, 130, 246, 0.1);
    border-left-color: #3b82f6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

.loader-text {
    font-family: 'Plus Jakarta Sans', sans-serif;
    color: #475569;
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.5s cubic-bezier(.36, .07, .19, .97) both;
}