@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

*, body {
    font-family: 'Inter', system-ui, sans-serif;
}

/* ── railway route animation ── */
.route-dash {
    stroke-dasharray: 10 6;
    animation: flowDash 18s linear infinite;
}

@keyframes flowDash {
    to { stroke-dashoffset: -320; }
}

/* pulse rings on station dots */
.station-pulse {
    animation: stationPulse 3s ease-in-out infinite;
}

@keyframes stationPulse {
    0%, 100% { opacity: .6; r: 5; }
    50%       { opacity: 1;  r: 7; }
}

/* ── login button ── */
.btn-login {
    background: linear-gradient(135deg, #4F9FD1 0%, #3a7fb5 100%);
    transition: filter .15s, transform .15s, box-shadow .15s;
}

.btn-login:hover:not(:disabled) {
    filter: brightness(1.1);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(79, 159, 209, .45);
}

.btn-login:active:not(:disabled) {
    transform: translateY(0);
}

.btn-login:disabled {
    opacity: .65;
    cursor: not-allowed;
}

/* ── input focus ring ── */
.login-input:focus {
    outline: none;
    border-color: #4F9FD1;
    box-shadow: 0 0 0 3px rgba(79, 159, 209, .2);
}

.login-input.error {
    border-color: #FC8181;
    box-shadow: 0 0 0 3px rgba(252, 129, 129, .2);
}

/* ── spinner ── */
.spinner {
    width: 18px;
    height: 18px;
    border: 2.5px solid rgba(255, 255, 255, .35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}

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

/* ── feature item hover ── */
.feature-item {
    transition: transform .18s;
}

.feature-item:hover {
    transform: translateX(5px);
}

/* ── background gradient ── */
.panel-dark {
    background: linear-gradient(155deg, #0b2d45 0%, #1a5a8a 55%, #1e6e9e 100%);
}

/* ── subtle grid overlay on dark panel ── */
.panel-dark::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

/* ── fade-in for the login card ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.fade-up {
    animation: fadeUp .5s ease both;
}

/* ── shake on error ── */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60%  { transform: translateX(-6px); }
    40%, 80%  { transform: translateX(6px); }
}

.shake {
    animation: shake .35s ease;
}