:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --accent-primary: #58a6ff;
    --accent-secondary: #1f6feb;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --success: #3fb950;
    --warning: #d29922;
    --error: #f85149;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-link {
    text-decoration: none;
    font-size: 1.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: var(--bg-primary);
}

.nav-link.active {
    background-color: var(--accent-secondary);
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.container h1 {
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--accent-secondary);
    color: var(--text-primary);
}

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

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

.btn-secondary:hover {
    border-color: var(--text-secondary);
}

.btn-danger {
    background-color: var(--error);
    color: var(--text-primary);
}

.btn-danger:hover {
    opacity: 0.9;
}

/* Input */
.input {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Login Section */
.login-card {
    text-align: center;
    padding: 3rem;
    background-color: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    max-width: 400px;
    margin: 4rem auto;
}

.login-card h1 {
    margin-bottom: 1rem;
}

.login-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Flight Cards */
.flight-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.flight-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.flight-route {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.flight-route .arrow {
    color: var(--text-secondary);
}

.flight-airline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.flight-details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.flight-details-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

.flight-detail {
    display: flex;
    flex-direction: column;
}

.flight-detail-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.flight-detail-value {
    font-weight: 500;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state h2 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    margin-bottom: 0.5rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Profile Page */
.profile-section {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.profile-section h2 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.profile-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.profile-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
}

.profile-name {
    font-size: 1.25rem;
    font-weight: 600;
}

.profile-email {
    color: var(--text-secondary);
}

.profile-field {
    margin-bottom: 1rem;
}

.profile-field label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.danger-zone {
    border-color: var(--error);
}

.danger-zone h2 {
    color: var(--error);
}

/* Phone Input */
.phone-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.phone-prefix {
    color: var(--text-secondary);
    font-size: 1rem;
    padding: 0.75rem 0;
    white-space: nowrap;
}

.phone-input-wrapper .input {
    flex: 1;
    margin-bottom: 0;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Flight Status Section */
.flight-status-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.status-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    background-color: var(--bg-primary);
    border-radius: 8px;
    overflow: hidden;
}

.status-loading-text {
    margin-bottom: 0.25rem;
}

.plane-spinner-track {
    width: 100%;
    position: relative;
    height: 1.75rem;
}

.plane-spinner {
    display: inline-block;
    font-size: 1.5rem;
    position: absolute;
    animation: fly-across 3s ease-in-out infinite;
}

@keyframes fly-across {
    0% {
        left: 0;
        transform: rotate(45deg);
    }
    45% {
        left: calc(100% - 1.75rem);
        transform: rotate(45deg);
    }
    50% {
        left: calc(100% - 1.75rem);
        transform: rotate(-135deg);
    }
    95% {
        left: 0;
        transform: rotate(-135deg);
    }
    100% {
        left: 0;
        transform: rotate(45deg);
    }
}

.status-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.status-on_time {
    background-color: var(--success);
    color: var(--bg-primary);
}

.status-delayed {
    background-color: var(--error);
    color: var(--text-primary);
}

.status-probably_delayed {
    background-color: var(--warning);
    color: var(--bg-primary);
}

.status-unknown {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.aircraft-info {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.status-error {
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-style: italic;
}

/* Flight History Grid */
.flight-history {
    margin-top: 1rem;
    font-size: 0.85rem;
}

.history-header {
    display: grid;
    grid-template-columns: 1fr repeat(4, minmax(60px, 80px)) minmax(75px, 100px);
    gap: 0.5rem;
    padding: 0.5rem;
    background-color: var(--bg-primary);
    border-radius: 8px 8px 0 0;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.7rem;
}

.history-header span:last-child {
    text-align: right;
}

.history-grid {
    border: 1px solid var(--border-color);
    border-radius: 0 0 8px 8px;
    overflow: hidden;
}

.history-row {
    display: grid;
    grid-template-columns: 1fr repeat(4, minmax(60px, 80px)) minmax(75px, 100px);
    gap: 0.5rem;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.history-row:last-child {
    border-bottom: none;
}

.history-row.users-flight {
    background-color: rgba(88, 166, 255, 0.1);
    font-weight: 500;
}

.history-route {
    font-weight: 500;
    color: var(--text-secondary);
}

.history-time {
    color: var(--text-secondary);
    text-align: center;
}

.history-status {
    color: var(--text-secondary);
    text-align: right;
    white-space: nowrap;
}

/* Delay color coding */
.delay-none {
    color: var(--success);
}

.delay-minor {
    color: var(--warning);
}

.delay-severe {
    color: var(--error);
}

/* Responsive */
@media (max-width: 600px) {
    .navbar {
        padding: 1rem 0.5rem;
    }

    .container {
        padding: 1rem 0.5rem;
    }

    .flight-route {
        font-size: 1rem;
    }

    /* Flight details responsive */
    .flight-details-row {
        grid-template-columns: 1fr 1fr;
    }

    .flight-details-row .flight-detail:nth-child(3) {
        grid-column: 1 / -1;
    }

    /* Status responsive */
    .status-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    /* History grid responsive */
    .history-header,
    .history-row {
        grid-template-columns: 1fr repeat(2, 60px) 70px;
        font-size: 0.75rem;
    }

    .history-header span:nth-child(3),
    .history-header span:nth-child(4),
    .history-row .history-time:nth-child(3),
    .history-row .history-time:nth-child(4) {
        display: none;
    }
}