/* ============================================================
   CSS Custom Properties — dark-first; light values via media query.
   Default (no OS preference, or OS dark mode) → dark palette.
   ============================================================ */

:root {
    /* backgrounds */
    --bg:               #111111;
    --bg-surface:       #1a1a1a;
    --bg-surface-alt:   #141414;
    --bg-table-header:  #1f1f1f;
    --bg-code:          #1f1f1f;
    --bg-footer:        #0a0a0a;
    --bg-nav:           #0d1117;

    /* borders */
    --border:           #2a2a2a;
    --border-subtle:    #222222;

    /* text */
    --text:             #d1d1d1;
    --text-muted:       #888888;
    --text-heading:     #f0f0f0;
    --nav-text:         #d0d0d0;

    /* brand / interactive */
    --brand:            #108db8;
    --link:             #4db8d9;
    --link-hover:       #77cde5;

    /* featured installer card */
    --featured-bg:      linear-gradient(135deg, rgba(16, 141, 184, 0.12) 0%, rgba(16, 141, 184, 0.06) 100%);

    /* shadows */
    --shadow-nav:       0 4px 24px 0 rgba(0, 0, 0, 0.45);
    --shadow-card:      0 1px 3px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: light) {
    :root {
        --bg:               #ffffff;
        --bg-surface:       #ffffff;
        --bg-surface-alt:   #fafbfc;
        --bg-table-header:  #f2f2f2;
        --bg-code:          #f5f5f5;
        --bg-footer:        #f8f9fa;
        --bg-nav:           #108db8;

        --border:           #cccccc;
        --border-subtle:    #dde3e8;

        --text:             #212529;
        --text-muted:       #555555;
        --text-heading:     #1a1a2e;
        --nav-text:         #ffffff;

        --brand:            #108db8;
        --link:             #108db8;
        --link-hover:       #0a6d91;

        --featured-bg:      linear-gradient(135deg, #f0f8ff 0%, #e8f4fd 100%);

        --shadow-nav:       0 4px 24px 0 rgba(34, 41, 47, 0.1);
        --shadow-card:      0 1px 3px rgba(0, 0, 0, 0.08);
    }
}

/* ============================================================
   Base
   ============================================================ */

* {
    scroll-behavior: smooth;
    box-sizing: border-box;
}

body {
    font-family: 'Lato', Arial, 'Lucida Grande', sans-serif;
    font-weight: 300;
    font-size: 16px;
    margin: 0;
    padding: 0;
    background-color: var(--bg);
    color: var(--text);
}

a {
    text-decoration: none;
    color: var(--link);
    font-weight: bold;
}

a:hover {
    color: var(--link-hover);
}

img {
    max-width: 100%;
}

/* ============================================================
   Nav
   ============================================================ */

nav {
    width: 100%;
    background: var(--bg-nav);
}

nav a {
    color: var(--nav-text);
    padding: 1rem;
    display: inline-block;
}

.d-flex {
    display: flex;
}

.content {
    padding: 1rem;
}

.navbar {
    display: flex;
    align-items: center;
    padding: 0 2rem;
}

.navbar-expand-sm {
    flex-wrap: nowrap;
    justify-content: flex-start;
}

.header-navbar {
    z-index: 999 !important;
    line-height: 1;
    padding: 0;
    min-height: 4.45rem;
    transition: 300ms ease all, background 0s;
    box-shadow: var(--shadow-nav);
    background-color: var(--bg-nav);
}

.navbar-brand {
    padding: 0 1rem;
}

.btn-secondary {
    background-color: #D98148 !important;
}

/* ============================================================
   Containers
   ============================================================ */

.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.step-container {
    border: 1px solid var(--border);
    border-radius: 2em;
    position: relative;
    padding: 2%;
    margin: 2% 0;
    background-color: var(--bg-surface);
}

.step-number {
    font-size: 2em;
    position: absolute;
    top: -10%;
    background: var(--bg);
    padding: 0 1%;
    color: var(--text-muted);
}

.step-description {
    padding-left: 2%;
}

.step-image {
    width: 30%;
    display: flex;
    justify-content: center;
    align-content: center;
    height: auto;
}

/* ============================================================
   Download table
   ============================================================ */

.download-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1%;
}

.download-table th,
.download-table td {
    padding: 1%;
    border: 1px solid var(--border);
}

.download-table th {
    background-color: var(--bg-table-header);
    color: var(--text);
    text-align: left;
}

/* ============================================================
   Button
   ============================================================ */

.button-link {
    display: inline-block;
    padding: 1% 2%;
    background: linear-gradient(to right, #f07533, #e65410);
    border: none;
    border-radius: 5px;
    color: white;
    font-size: 1em;
    font-weight: bold;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
    box-shadow: 0 2px 2px rgba(0, 0, 0, 0.2);
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.button-link:hover {
    background: linear-gradient(to right, #f58634, #e76420);
    box-shadow: 0 4px 4px rgba(0, 0, 0, 0.2);
    text-decoration: none;
    color: white;
    transform: translateY(-2px);
}

.button-link:active {
    background: linear-gradient(to right, #e65410, #c54310);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
    transform: translateY(1px);
}

.button-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 1%;
}

/* ============================================================
   Images
   ============================================================ */

.apple-desktop {
    width: 50%;
    height: auto;
}

/* ============================================================
   Footer
   ============================================================ */

footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    text-align: right;
    background-color: var(--bg-footer);
    border-top: 1px solid var(--border);
    padding: 1%;
    box-sizing: border-box;
}

.footer-content {
    font-size: 0.8em;
    margin-right: 2%;
    color: var(--text-muted);
}

/* ============================================================
   Responsive — tablet and up
   ============================================================ */

@media (min-width: 768px) {
    .content {
        padding: 2% 6%;
    }

    .step-container {
        padding: 2%;
        margin: 2% 0;
    }

    .step-header {
        font-size: 2.5em;
        top: -20%;
        padding: 0 1%;
    }

    .download-table th,
    .download-table td {
        padding: 1%;
    }

    .step-number {
        font-size: 2.5em;
        padding-right: 2%;
    }

    .button-link {
        padding: 1% 2%;
        font-size: 1.2em;
    }

    footer {
        padding: 1%;
    }

    .footer-content {
        font-size: 1em;
        margin-right: 2%;
    }
}

/* ============================================================
   Responsive — mobile
   ============================================================ */

@media (max-width: 767px) {
    .content {
        padding: 5% 10%;
    }

    .step-container {
        padding: 4%;
        margin: 4% 0;
    }

    .step-header {
        font-size: 1.5em;
        padding: 0 4%;
    }

    .button-link {
        padding: 3% 6%;
        font-size: 1em;
    }

    footer {
        padding: 2%;
    }

    .footer-content {
        font-size: 0.8em;
        margin-right: 4%;
    }

    .step-image {
        width: 75%;
        display: flex;
        justify-content: center;
        max-width: 100%;
        height: auto;
    }

    ol {
        padding-left: 20px;
    }

    li {
        margin-left: 0;
        padding-left: 0;
    }
}

/* ============================================================
   SSP-007: Sign-in landing page
   ============================================================ */

.signin-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 3rem 1rem;
    max-width: 480px;
    margin: 4rem auto;
}

.signin-container h4 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-heading);
}

.signin-container p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* ============================================================
   SSP-004: Installer card / tile layout
   ============================================================ */

.installer-cards {
    width: 100%;
    padding: 0.5rem 0;
}

/* Featured card — shown when platform is detected */
.installer-card--featured {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--featured-bg);
    border: 2px solid var(--brand);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    position: relative;
}

.installer-card__badge {
    position: absolute;
    top: -12px;
    background: var(--brand);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 12px;
    border-radius: 20px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.installer-card__icon {
    font-size: 2.5rem;
    color: var(--brand);
    margin: 0.75rem 0 0.5rem;
}

.installer-card--featured .installer-card__icon {
    font-size: 3rem;
}

.installer-card__name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 1rem;
}

.installer-card__cta {
    margin-top: 0.25rem;
}

/* Secondary / equal grid — all other platforms */
.installer-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
    margin-top: 0.5rem;
}

.installer-card--secondary,
.installer-card--equal {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 1.25rem 0.75rem;
    text-align: center;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.installer-card--secondary:hover,
.installer-card--equal:hover {
    border-color: var(--brand);
    box-shadow: 0 2px 8px rgba(16, 141, 184, 0.18);
}

.installer-card__link {
    font-size: 0.85rem;
    color: var(--link);
    font-weight: 600;
    margin-top: 0.5rem;
}

.installer-card__link:hover {
    color: var(--link-hover);
}

/* ============================================================
   SSP-016: Safari gate
   ============================================================ */

.safari-gate {
    text-align: center;
}

.safari-gate__icon {
    font-size: 2.5rem;
    color: #e07b00;
    display: block;
    margin-bottom: 1rem;
}

.safari-gate__url {
    font-size: 0.8rem;
    color: var(--text-muted);
    word-break: break-all;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    margin: 1rem 0;
    text-align: left;
}

.safari-gate__copy-btn {
    display: inline-block;
    margin: 0.25rem auto 0.5rem;
}

.safari-gate__hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ============================================================
   Responsive — small screens
   ============================================================ */

@media (max-width: 600px) {
    .installer-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .signin-container {
        margin: 2rem auto;
        padding: 2rem 1rem;
    }
}