:root {
    --brand-yellow: #ffc400;
    --brand-brown: #351c15;
    --brand-blue: #005bb8;
    --brand-teal: #008272;
    --brand-green: #008272;
    --bg-light: #f4f4f4;
    --text-dark: #121212;
    --text-muted: #5f5753;
    --border-color: #dfdbd7;
    --white: #ffffff;
    --max-content-width: 1000px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
}

body {
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.5;
}

a {
    color: var(--brand-blue);
    text-decoration: underline;
}
a:hover {
    text-decoration: none;
}

/* Alert Banner */
.alert-banner {
    background-color: var(--brand-yellow);
    color: var(--text-dark);
    text-align: center;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
}
.alert-banner a {
    color: var(--text-dark);
}

/* Header */
.main-header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
}
.header-inner {
    display: flex;
    align-items: center;
    padding: 16px 24px;
    max-width: var(--max-content-width);
    margin: 0 auto;
}
.mock-logo {
    width: 48px;
    height: 58px;
    margin-right: 32px;
}
.desktop-nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    margin-right: 24px;
    font-size: 16px;
}
.desktop-nav a:hover {
    text-decoration: underline;
}

/* Main Content */
.main-content {
    max-width: var(--max-content-width);
    margin: 32px auto;
    padding: 0 16px;
}

/* Search View */
.search-container {
    background: var(--white);
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    max-width: 600px;
    margin: 0 auto;
}
.search-container h1 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--brand-brown);
}
.input-group {
    margin-bottom: 16px;
}
.input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
}
.error-message {
    color: #d32f2f;
    margin-top: 16px;
    font-size: 14px;
    font-weight: 500;
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Tracking Result View */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--brand-blue);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 16px;
    text-decoration: none;
}

.claim-alert {
    background-color: #fff9e6;
    border: 1px solid var(--brand-yellow);
    padding: 16px;
    margin-bottom: 16px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    border-radius: 4px;
}
.claim-alert svg {
    flex-shrink: 0;
    color: var(--text-dark);
    margin-top: 2px;
}
.claim-alert span {
    font-size: 14px;
}

.tracking-card {
    background: var(--white);
    border-radius: 4px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    overflow: hidden;
}
.tracking-card-content {
    padding: 24px;
}

.tracking-meta {
    margin-bottom: 24px;
}
.meta-label {
    font-size: 14px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
}
.tracking-number {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}
.meta-link {
    font-size: 14px;
    color: var(--brand-blue);
}

.delivery-status-box {
    margin-bottom: 32px;
}
.status-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.status-main-text {
    font-size: 24px;
    font-weight: 500;
    color: var(--brand-teal);
    line-height: 1.2;
}

/* Timeline */
.timeline {
    position: relative;
    margin-bottom: 32px;
    margin-left: 8px;
}
.timeline-item {
    position: relative;
    padding-left: 32px;
    padding-bottom: 24px;
}
.timeline-item:last-child {
    padding-bottom: 0;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 24px;
    bottom: -8px;
    width: 2px;
    background-color: var(--border-color);
}
.timeline-item.completed::before, .timeline-item.current::before {
    background-color: var(--brand-green);
}
.timeline-item.dotted::before {
    background: transparent;
    border-left: 2px dotted var(--text-muted);
}
.timeline-item:last-child::before {
    display: none;
}
.timeline-icon {
    position: absolute;
    left: 0;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--white);
    border: 2px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}
.timeline-item.completed .timeline-icon {
    background-color: var(--brand-green);
    border-color: var(--brand-green);
}
.timeline-item.completed .timeline-icon::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}
.timeline-item.current .timeline-icon {
    border-color: var(--brand-green);
    width: 24px;
    height: 24px;
    left: -3px;
    top: -3px;
}
.timeline-item.current .timeline-icon svg {
    color: var(--brand-green);
    width: 16px;
    height: 16px;
}

.timeline-content {
    font-size: 15px;
    color: var(--text-muted);
}
.timeline-item.current .timeline-content, .timeline-item.completed .timeline-content {
    color: var(--text-dark);
}
.timeline-item.current .timeline-content {
    font-weight: 500;
    font-size: 16px;
}

.ship-to-box {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}
.ship-to-label {
    font-size: 14px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
}
.ship-to-address {
    font-size: 14px;
    color: var(--text-dark);
    text-transform: uppercase;
}
.delivered-button-container {
    margin-top: 16px;
}

/* Actions */
.tracking-actions {
    background-color: #f9f9f9;
    border-top: 1px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.btn-primary {
    background-color: var(--brand-yellow);
    color: var(--text-dark);
    border: none;
    padding: 10px 24px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 24px;
    cursor: pointer;
    transition: background 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary:hover {
    background-color: #e6b000;
}
.btn-outline {
    background-color: var(--white);
    color: var(--brand-blue);
    border: 2px solid var(--brand-blue);
    padding: 8px 24px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 24px;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-outline:hover {
    background-color: rgba(0, 91, 184, 0.05);
}
.btn-text {
    background: none;
    border: none;
    color: var(--brand-blue);
    font-size: 16px;
    text-decoration: underline;
    cursor: pointer;
    padding: 8px;
}
.btn-text:hover {
    text-decoration: none;
}
.pill-btn {
    border-radius: 999px;
}

/* Modals */
.custom-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}
.custom-modal {
    background: var(--white);
    width: 90%;
    max-width: 600px;
    border-radius: 8px;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}
.modal-wide {
    max-width: 700px;
}
.close-modal {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.modal-header-tabs {
    display: flex;
    border-bottom: 4px solid var(--brand-teal);
    padding: 0 16px;
    margin-top: 48px;
}
.tab-btn {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-dark);
}
.tab-btn.active {
    background-color: var(--brand-teal);
    color: var(--white);
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
}

.modal-content {
    padding: 24px;
}
.last-updated {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.detail-item label {
    font-size: 14px;
    color: var(--text-dark);
    font-weight: 500;
    display: block;
    margin-bottom: 4px;
}
.detail-item div {
    font-size: 14px;
    color: var(--text-muted);
}

.modal-footer {
    padding: 24px;
    text-align: center;
}

/* Proof Modal Specifics */
.proof-header {
    font-size: 28px;
    font-weight: 400;
    color: var(--text-dark);
    padding: 24px 24px 0;
}
.proof-divider {
    height: 3px;
    background-color: var(--brand-yellow);
    width: 60px;
    margin: 16px 24px 24px;
}
.proof-content {
    padding: 0 24px 24px;
}
.proof-content p {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 8px;
}
.mt-2 { margin-top: 16px; }
.text-sm { font-size: 13px !important; }
.text-gray { color: var(--text-muted) !important; }
.inline-block { display: inline-block; }

/* Progress History Table-like */
.progress-history {
    margin-bottom: 24px;
}
.history-row {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}
.history-row:last-child {
    border-bottom: none;
}
.history-date {
    width: 120px;
    font-size: 14px;
    color: var(--text-muted);
}
.history-status {
    flex-grow: 1;
}
.history-status-main {
    font-weight: 500;
    font-size: 14px;
    color: var(--text-dark);
}
.history-location {
    font-size: 14px;
    color: var(--text-muted);
}
.ups-my-choice {
    font-size: 14px;
    color: var(--text-dark);
    line-height: 1.6;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .header-inner {
        padding: 12px 16px;
    }
    .desktop-nav {
        display: none; /* Hide on mobile to match "thumb-friendly interactions" intent */
    }
    .tracking-card-content {
        padding: 16px;
    }
    .tracking-actions {
        padding: 16px;
        flex-direction: column;
        align-items: stretch;
    }
    .btn-primary, .btn-outline {
        width: 100%;
        justify-content: center;
    }
    .detail-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .timeline {
        margin-left: 4px;
    }
}