:root {
    --bg:        #f5f7fb;
    --bg-card:   #ffffff;
    --bg-soft:   #f1f4fa;
    --border:    #e5e9f2;
    --accent:    #4361ee;
    --accent-2:  #7048e8;
    --text:      #1a2238;
    --text-dim:  #5a6781;
    --good:      #16a34a;
    --warn:      #d97706;
    --warn-bg:   #fff7ed;
    --shadow:    0 12px 40px rgba(20, 32, 70, .08);
    --radius:    14px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0; padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

.page {
    max-width: 760px;
    margin: 0 auto;
    padding: 32px 20px 80px;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    color: var(--text-dim);
    font-size: 14px;
}

.lang-select {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 14px;
    cursor: pointer;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 36px 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.hero {
    text-align: center;
}

.bell {
    width: 88px; height: 88px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 12px 28px rgba(67, 97, 238, .25);
    animation: pulse 2.2s ease-in-out infinite;
}
.bell svg { width: 44px; height: 44px; fill: #fff; }

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.06); }
}

h1 {
    font-size: 28px;
    margin: 0 0 12px;
    font-weight: 700;
    color: var(--text);
}

.subtitle {
    color: var(--text-dim);
    font-size: 16px;
    margin: 0 0 8px;
}

.referrer {
    display: inline-block;
    background: var(--bg-soft);
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 13px;
    color: var(--text-dim);
    margin-top: 12px;
    border: 1px solid var(--border);
}

.detected-browser {
    text-align: center;
    margin: 28px 0 16px;
    font-size: 14px;
    color: var(--text-dim);
}

.instructions {
    margin-top: 16px;
}
.instructions h2 {
    font-size: 18px;
    margin: 0 0 16px;
    text-align: center;
    color: var(--text);
}

/* Browser-window mockup */
.browser-mock {
    background: #e9edf3;
    border-radius: 10px;
    margin: 0 auto 20px;
    max-width: 460px;
    overflow: hidden;
    box-shadow: 0 10px 28px rgba(20, 32, 70, .12);
    border: 1px solid var(--border);
}
.browser-mock .titlebar {
    background: #dde2ec;
    padding: 8px 12px;
    display: flex; gap: 6px; align-items: center;
}
.browser-mock .dot { width: 10px; height: 10px; border-radius: 50%; background: #b8c0d0; }
.browser-mock .urlbar {
    flex: 1;
    background: #fff;
    margin-left: 10px;
    border-radius: 6px;
    height: 24px;
    display: flex; align-items: center;
    padding: 0 8px;
    font-size: 11px;
    color: #555;
    position: relative;
    border: 1px solid #cdd3dd;
}
.browser-mock .urlbar::before {
    content: "🔒";
    margin-right: 6px;
    font-size: 10px;
}

/* The permission popup that drops down from URL bar */
.perm-popup {
    background: #fff;
    color: #1a1a1a;
    padding: 16px;
    margin: 0 14px 14px;
    border-radius: 6px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .15);
    position: relative;
    animation: drop 1.6s ease-in-out infinite;
    border: 1px solid #e0e0e0;
}
.perm-popup::before {
    content: "";
    position: absolute; top: -8px; left: 30px;
    width: 0; height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #fff;
}
.perm-popup .perm-site {
    font-size: 12px;
    color: #6b7280;
    margin-bottom: 4px;
}
.perm-popup .perm-text {
    font-size: 13px;
    margin-bottom: 12px;
    color: #111827;
}
.perm-popup .perm-buttons {
    display: flex; gap: 8px; justify-content: flex-end;
}
.perm-popup button {
    border: 1px solid #d0d0d0;
    background: #f5f5f5;
    color: #333;
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 12px;
    cursor: default;
}
.perm-popup button.allow {
    background: #1a73e8;
    color: #fff;
    border-color: #1a73e8;
    box-shadow: 0 0 0 0 rgba(26, 115, 232, .6);
    animation: glow 1.6s ease-in-out infinite;
}

/* Firefox variant */
.browser-mock.firefox .perm-popup button.allow {
    background: #0060df;
    border-color: #0060df;
}

/* Safari variant */
.browser-mock.safari .perm-popup button.allow {
    background: #007aff;
    border-color: #007aff;
}

/* Edge variant */
.browser-mock.edge .perm-popup button.allow {
    background: #0078d4;
    border-color: #0078d4;
}

/* Opera variant */
.browser-mock.opera .perm-popup button.allow {
    background: #ff1b2d;
    border-color: #ff1b2d;
}

@keyframes drop {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(4px); }
}
@keyframes glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(67, 97, 238, .0); }
    50%      { box-shadow: 0 0 0 6px rgba(67, 97, 238, .35); }
}

.arrow-hint {
    text-align: center;
    margin: -4px 0 16px;
    color: var(--warn);
    font-size: 13px;
    font-weight: 600;
}
.arrow-hint::before { content: "👆 "; }

ol.steps {
    counter-reset: stp;
    list-style: none;
    padding: 0; margin: 0 0 24px;
}
ol.steps li {
    counter-increment: stp;
    padding: 12px 14px 12px 50px;
    margin: 0 0 10px;
    background: var(--bg-soft);
    border-radius: 10px;
    position: relative;
    font-size: 15px;
    border: 1px solid var(--border);
    color: var(--text);
}
ol.steps li::before {
    content: counter(stp);
    position: absolute;
    left: 14px; top: 50%;
    transform: translateY(-50%);
    width: 26px; height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    font-size: 13px;
}

.tip {
    background: var(--warn-bg);
    border-left: 3px solid var(--warn);
    color: #7c2d12;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 24px;
}

.cta {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    border: 0;
    padding: 18px 28px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 10px 24px rgba(67, 97, 238, .25);
    transition: transform .12s ease, box-shadow .12s ease;
}
.cta:hover  { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(67, 97, 238, .3); }
.cta:active { transform: translateY(0); }

.footer-note {
    text-align: center;
    color: var(--text-dim);
    font-size: 12px;
    margin-top: 28px;
}

/* Mobile tweaks */
@media (max-width: 520px) {
    .card { padding: 24px 18px; }
    h1    { font-size: 22px; }
    .subtitle { font-size: 14px; }
    .bell { width: 72px; height: 72px; }
    .bell svg { width: 36px; height: 36px; }
}