:root {
    --bg: #0d0d0d;
    --card-bg: #161616;
    --border: #252525;
    --border-focus: #56baed;
    --text: #e4e4e4;
    --text-muted: #777;
    --accent: #56baed;
    --accent-hover: #39ace7;
    --accent-text: #0a0a0a;
    --error: #d95f5f;
    --error-bg: rgba(217, 95, 95, 0.08);
    --error-border: rgba(217, 95, 95, 0.25);
    --input-bg: #1c1c1c;
    --radius: 8px;
}

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

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: "Poppins", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 14px;
    width: 100%;
    max-width: 400px;
    padding: 36px 28px 32px;
}

/* ── Header ── */

.login-header {
    text-align: center;
    margin-bottom: 28px;
}

.login-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
    letter-spacing: -0.4px;
}

/* ── Fields ── */

.field-group {
    margin-bottom: 14px;
}

.field-group label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    pointer-events: none;
    z-index: 1;
}

.input-wrap input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.92rem;
    font-family: inherit;
    padding: 11px 40px 11px 38px;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
    -webkit-appearance: none;
    appearance: none;
}

.input-wrap input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(86, 186, 237, 0.1);
}

.input-wrap input::placeholder {
    color: #444;
}

.input-wrap input.is-invalid {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(217, 95, 95, 0.1);
}

/* ── Toggle password ── */

.toggle-password {
    position: absolute;
    right: 11px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    font-size: 13px;
    transition: color 0.15s;
    border-radius: 4px;
}

.toggle-password:hover {
    color: var(--text);
}

.toggle-password:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 1px;
}

/* ── Inline error ── */

.error-message {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.83rem;
    color: var(--error);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: var(--radius);
    padding: 10px 12px;
    margin-bottom: 14px;
    line-height: 1.4;
}

.error-message[hidden] {
    display: none;
}

.error-message svg {
    flex-shrink: 0;
    margin-top: 1px;
}

/* ── Submit button ── */

#loginBtn {
    width: 100%;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: var(--radius);
    font-size: 0.92rem;
    font-weight: 600;
    font-family: inherit;
    padding: 12px;
    cursor: pointer;
    transition: background 0.18s ease, transform 0.1s ease, opacity 0.18s ease;
    margin-top: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.01em;
}

#loginBtn:hover:not(:disabled) {
    background: var(--accent-hover);
}

#loginBtn:active:not(:disabled) {
    transform: scale(0.98);
}

#loginBtn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

/* ── Loading spinner ── */

.btn-spinner {
    width: 15px;
    height: 15px;
    border: 2px solid rgba(10, 10, 10, 0.25);
    border-top-color: var(--accent-text);
    border-radius: 50%;
    animation: spin 0.55s linear infinite;
    flex-shrink: 0;
}

.btn-spinner[hidden] {
    display: none;
}

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

/* ── Entrance animation ── */

.fadeInDown {
    animation: fadeInDown 0.45s ease both;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}