/* CSS styled to match the GitHub Primer Design System */

:root {
    --color-canvas-default: #ffffff;
    --color-canvas-subtle: #f6f8fa;
    --color-fg-default: #24292f;
    --color-fg-muted: #57606a;
    --color-fg-on-emphasis: #ffffff;
    --color-border-default: #d0d7de;
    --color-accent-fg: #0969da;
    --color-accent-emphasis: #0969da;
    --color-accent-subtle: #ddf4ff;
    --color-success-fg: #1a7f37;
    --color-success-emphasis: #1f883d;
    --color-success-subtle: #dafbe1;
    --color-danger-fg: #cf222e;
    --color-danger-subtle: #ffebe9;
    --color-btn-bg: #f6f8fa;
    --color-btn-hover-bg: #f3f4f6;
    --color-btn-primary-bg: #1f883d;
    --color-btn-primary-hover-bg: #1a7f37;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

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

body {
    font-family: var(--font-stack);
    background-color: var(--color-canvas-subtle);
    color: var(--color-fg-default);
    line-height: 1.5;
    font-size: 14px;
}

/* Header & Layout */
header {
    background-color: #24292f;
    color: #ffffff;
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header a.brand {
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

header nav a {
    color: #c9d1d9;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    margin-left: 16px;
}

header nav a:hover {
    color: #ffffff;
}

.container {
    max-width: 980px;
    margin: 32px auto;
    padding: 0 16px;
}

/* Grid & Layout Helpers */
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.flex-column { flex-direction: column; }
.flex-1 { flex: 1; }
.w-full { width: 100%; }
.text-right { text-align: right; }

/* Primer Box (GitHub Cards) */
.Box {
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    overflow: hidden;
}

.Box-header {
    background-color: var(--color-canvas-subtle);
    padding: 16px;
    border-bottom: 1px solid var(--color-border-default);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.Box-title {
    font-size: 14px;
    font-weight: 600;
}

.Box-row {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border-default);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.1s ease;
}

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

.Box-row.is-hoverable:hover {
    background-color: var(--color-canvas-subtle);
    cursor: pointer;
}

.Box-body {
    padding: 16px;
}

/* Form inputs & fields */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 5px 12px;
    font-size: 14px;
    line-height: 20px;
    color: var(--color-fg-default);
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    outline: none;
    box-shadow: inset 0 1px 0 rgba(208,215,222,0.2);
}

.form-control:focus {
    border-color: var(--color-accent-emphasis);
    box-shadow: 0 0 0 3px rgba(9,105,218,0.3);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 5px 16px;
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    background-color: var(--color-btn-bg);
    color: var(--color-fg-default);
    outline: none;
    text-align: center;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--color-btn-hover-bg);
    text-decoration: none;
}

.btn-primary {
    color: var(--color-fg-on-emphasis);
    background-color: var(--color-btn-primary-bg);
    border-color: rgba(27,31,36,0.15);
}

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

.btn-link {
    background: transparent;
    border: none;
    color: var(--color-accent-fg);
    padding: 0;
    font-weight: 500;
}

.btn-link:hover {
    text-decoration: underline;
    background: transparent;
}

/* Badges */
.State {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 500;
    line-height: 18px;
    border-radius: 2em;
    border: 1px solid transparent;
}

.State--sent {
    color: var(--color-accent-fg);
    background-color: var(--color-accent-subtle);
    border-color: rgba(9,105,218,0.2);
}

.State--received {
    color: var(--color-success-fg);
    background-color: var(--color-success-subtle);
    border-color: rgba(31,136,61,0.2);
}

/* Typography & Utilities */
h1 { font-size: 24px; font-weight: 400; }
h2 { font-size: 20px; font-weight: 600; }
h3 { font-size: 16px; font-weight: 600; }
.f-small { font-size: 12px; }
.fw-semibold { font-weight: 600; }
.text-muted { color: var(--color-fg-muted); }
.text-accent { color: var(--color-accent-fg); }
.text-success { color: var(--color-success-fg); }
.text-danger { color: var(--color-danger-fg); }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mr-2 { margin-right: 8px; }

/* Central Tracking Search Input (Public Page) */
.tracking-search-card {
    max-width: 500px;
    margin: 80px auto 40px;
    padding: 24px;
    text-align: center;
}

/* Modals / Sidebars */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.modal-content {
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 8px 24px rgba(140,149,159,0.2);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border-default);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* Blank Slate (Empty list style) */
.blankslate {
    padding: 32px;
    text-align: center;
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
}

/* Toast Messages */
.flash-messages {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 1000;
}

.flash {
    padding: 12px 16px;
    border-radius: 6px;
    border: 1px solid var(--color-border-default);
    font-size: 13px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    background-color: var(--color-canvas-default);
    display: flex;
    align-items: center;
    gap: 8px;
    animation: slideIn 0.3s ease forwards;
}

.flash--success {
    background-color: var(--color-success-subtle);
    border-color: rgba(31,136,61,0.2);
    color: var(--color-success-fg);
}

.flash--error {
    background-color: var(--color-danger-subtle);
    border-color: rgba(207,34,46,0.2);
    color: var(--color-danger-fg);
}

@keyframes slideIn {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}