/* ============================================================
   Ark Translate — theme system (dark default + light)
   ============================================================ */
:root {
    --bg: #0b1220;
    --bg-elev: #111a2e;
    --bg-elev-2: #16223c;
    --surface: #0f1830;
    --border: #243353;
    --text: #e6edf7;
    --text-muted: #95a6c4;
    --primary: #6366f1;
    --primary-600: #4f46e5;
    --primary-soft: rgba(99, 102, 241, 0.15);
    --accent: #22d3ee;
    --success: #34d399;
    --danger: #f87171;
    --warning: #fbbf24;
    --code-bg: #0a1326;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
    --radius: 14px;
}

[data-theme="light"] {
    --bg: #f4f7fc;
    --bg-elev: #ffffff;
    --bg-elev-2: #eef2fb;
    --surface: #ffffff;
    --border: #d8e0ef;
    --text: #0f1830;
    --text-muted: #59657d;
    --primary: #4f46e5;
    --primary-600: #4338ca;
    --primary-soft: rgba(79, 70, 229, 0.1);
    --accent: #0891b2;
    --code-bg: #0f1830;
    --shadow: 0 10px 30px rgba(20, 30, 60, 0.12);
}

html { position: relative; min-height: 100%; font-size: 15px; }
@media (min-width: 768px) { html { font-size: 16px; } }

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color .2s ease, color .2s ease;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-600); text-decoration: underline; }
.text-muted { color: var(--text-muted) !important; }
hr { border-color: var(--border); opacity: 1; }

/* ---- Navbar -------------------------------------------------- */
.navbar {
    background: color-mix(in srgb, var(--bg-elev) 85%, transparent) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border) !important;
    box-shadow: none !important;
}
.navbar .navbar-brand,
.navbar .nav-link { color: var(--text) !important; }
.navbar .nav-link:hover { color: var(--primary) !important; }
.navbar-brand { font-weight: 800; letter-spacing: -.3px; }
.brand-dot { color: var(--accent); }

/* ---- Cards & surfaces --------------------------------------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.card-header {
    background: var(--bg-elev-2);
    border-bottom: 1px solid var(--border);
    color: var(--text);
    border-top-left-radius: var(--radius) !important;
    border-top-right-radius: var(--radius) !important;
}

/* ---- Forms --------------------------------------------------- */
.form-control, .form-select {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    color: var(--text);
}
.form-control:focus, .form-select:focus {
    background: var(--bg-elev);
    color: var(--text);
    border-color: var(--primary);
    box-shadow: 0 0 0 .2rem var(--primary-soft);
}
.form-control::placeholder { color: var(--text-muted); }
.form-label { color: var(--text-muted); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .4px; }

/* ---- Buttons ------------------------------------------------- */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-600));
    border: none;
    font-weight: 600;
    box-shadow: 0 6px 16px var(--primary-soft);
    color: #fff;
}
.btn-primary:hover { filter: brightness(1.08); color: #fff; }
.btn-ghost {
    border: 1px solid var(--border);
    color: var(--text);
    background: transparent;
}
.btn-ghost:hover { background: var(--bg-elev-2); color: var(--text); }

/* ---- Code / console ----------------------------------------- */
pre, code { font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace; }
.code-block {
    position: relative;
    background: var(--code-bg);
    color: #cde3ff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    overflow-x: auto;
    font-size: .85rem;
    line-height: 1.55;
    white-space: pre-wrap;
    word-break: break-all;
}
.copy-btn {
    position: absolute; top: 8px; right: 8px;
    border: 1px solid var(--border); background: var(--bg-elev-2);
    color: var(--text); border-radius: 8px; padding: 2px 10px; font-size: .75rem; cursor: pointer;
}
.copy-btn:hover { background: var(--primary); color: #fff; }

/* ---- Chips --------------------------------------------------- */
.chip {
    display: inline-flex; align-items: center; gap: .4rem;
    background: var(--primary-soft); color: var(--text);
    border: 1px solid var(--border); border-radius: 999px;
    padding: .25rem .7rem; font-size: .8rem; font-weight: 600;
}

/* ---- Landing page ------------------------------------------- */
.hero { padding: 5rem 0 3rem; text-align: center; position: relative; }
.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 800; letter-spacing: -1.5px; line-height: 1.05; margin-bottom: 1rem;
}
.gradient-text {
    background: linear-gradient(120deg, var(--primary), var(--accent));
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.lead { color: var(--text-muted); font-size: 1.2rem; max-width: 720px; margin: 0 auto 2rem; }
.hero-glow { position: absolute; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.hero-glow::before {
    content: ""; position: absolute; top: -20%; left: 50%; transform: translateX(-50%);
    width: 700px; height: 700px; border-radius: 50%;
    background: radial-gradient(circle, var(--primary-soft), transparent 60%);
}
.feature-card { height: 100%; padding: 1.5rem; }
.feature-card .icon {
    width: 44px; height: 44px; display: grid; place-items: center;
    border-radius: 12px; background: var(--primary-soft); font-size: 1.4rem; margin-bottom: 1rem;
}
.section { padding: 3.5rem 0; }
.section h2 { font-weight: 800; letter-spacing: -.5px; margin-bottom: .5rem; }
.step-num {
    width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
    background: var(--primary); color: #fff; font-weight: 700; flex: 0 0 auto;
}

/* ---- Captcha & OTP ------------------------------------------ */
.captcha-box { display: flex; align-items: center; gap: .75rem; }
.captcha-box img { border-radius: 10px; border: 1px solid var(--border); }
.otp-display {
    font-family: ui-monospace, monospace; font-size: 2rem; font-weight: 800;
    letter-spacing: .5rem; color: var(--accent);
}

/* ---- Theme toggle ------------------------------------------- */
.theme-toggle {
    border: 1px solid var(--border); background: var(--bg-elev-2); color: var(--text);
    width: 38px; height: 38px; border-radius: 10px; cursor: pointer; font-size: 1.05rem;
    display: grid; place-items: center;
}
.theme-toggle:hover { border-color: var(--primary); }

/* ---- Footer -------------------------------------------------- */
.footer { border-top: 1px solid var(--border); color: var(--text-muted); padding: 1.5rem 0; margin-top: 3rem; }

.alert-danger { background: rgba(248,113,113,.12); border-color: var(--danger); color: var(--danger); }
.alert-info { background: var(--primary-soft); border-color: var(--primary); color: var(--text); }
.alert-warning { background: rgba(251,191,36,.12); border-color: var(--warning); color: var(--text); }
.alert-success { background: rgba(52,211,153,.12); border-color: var(--success); color: var(--text); }