/*
  Styling overview:
    - Dark, centered auth card.
    - Teal accent for primary actions.
    - Small alert blocks for error/logout messages.
*/
:root {
    --bg: #070b10;
    --panel: #0d141c;
    --panel2: #0a1017;
    --text: #e8f0ff;
    --muted: #a7b3c8;
    --teal: #19f6e8;
    --teal2: #00c9bf;
    --danger: #ff4d4d;
    --stroke: rgba(25, 246, 232, 0.18);
    --shadow: 0 25px 60px rgba(0, 0, 0, 0.65);
    --r: 18px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial,
    sans-serif;
    background: radial-gradient(
            1000px 600px at 10% 10%,
            rgba(25, 246, 232, 0.12),
            transparent 60%
    ),
    radial-gradient(
            900px 600px at 90% 20%,
            rgba(0, 201, 191, 0.08),
            transparent 60%
    ),
    linear-gradient(180deg, #05070b, var(--bg));
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

/* Login card container. */
.login-container {
    width: 100%;
    max-width: 420px;
    background: linear-gradient(
            180deg,
            rgba(13, 20, 28, 0.96),
            rgba(10, 16, 23, 0.96)
    );
    border-radius: var(--r);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
    padding: 32px 28px;
    position: relative;
    overflow: hidden;
}

/* Subtle decorative overlay. */
.login-container:before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(
            600px 200px at 0% 0%,
            rgba(25, 246, 232, 0.08),
            transparent 55%
    );
    opacity: 0.9;
}

.login-container > * {
    position: relative;
}

/* Brand/identity section. */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.logo-badge {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--teal), var(--teal2));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: #001b1a;
    font-size: 18px;
    box-shadow: 0 10px 28px rgba(25, 246, 232, 0.25);
}

h1 {
    margin: 0;
    font-size: 18px;
    font-weight: 800;
}

.subtitle {
    margin-top: 4px;
    font-size: 13px;
    color: var(--muted);
}

/* Form layout. */
form {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

label {
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
}

input {
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--stroke);
    background: var(--panel2);
    color: var(--text);
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus {
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(25, 246, 232, 0.15);
}

/* Primary submit button. */
.btn {
    margin-top: 8px;
    padding: 11px 14px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    font-weight: 800;
    font-size: 14px;
    letter-spacing: 0.3px;
    background: linear-gradient(90deg, var(--teal), var(--teal2));
    color: #001b1a;
    box-shadow: 0 16px 35px rgba(25, 246, 232, 0.18);
    transition: transform 0.08s ease, opacity 0.15s ease;
}

.btn:hover {
    transform: translateY(-1px);
    opacity: 0.95;
}

/* Feedback alerts for error/logout. */
.alert {
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 10px;
}

.alert.error {
    background: rgba(255, 77, 77, 0.12);
    border: 1px solid rgba(255, 77, 77, 0.4);
    color: var(--danger);
}

.alert.success {
    background: rgba(25, 246, 232, 0.12);
    border: 1px solid rgba(25, 246, 232, 0.4);
    color: var(--teal);
}

.footer {
    margin-top: 22px;
    font-size: 11px;
    color: var(--muted);
    text-align: center;
}