@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-Thin.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-Thin.woff') format('woff'),
         url('/assets/fonts/YekanSans-Thin.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-Thin.otf') format('opentype');
    font-weight: 100; /* Thin */
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-Light.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-Light.woff') format('woff'),
         url('/assets/fonts/YekanSans-Light.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-Light.otf') format('opentype');
    font-weight: 300; /* Light */
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-Regular.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-Regular.woff') format('woff'),
         url('/assets/fonts/YekanSans-Regular.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-Regular.otf') format('opentype');
    font-weight: 400; /* Regular */
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-Bold.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-Bold.woff') format('woff'),
         url('/assets/fonts/YekanSans-Bold.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-Bold.otf') format('opentype');
    font-weight: 700; /* Bold */
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-ExtraBold.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-ExtraBold.woff') format('woff'),
         url('/assets/fonts/YekanSans-ExtraBold.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-ExtraBold.otf') format('opentype');
    font-weight: 800; /* Extra Bold */
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-Black.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-Black.woff') format('woff'),
         url('/assets/fonts/YekanSans-Black.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-Black.otf') format('opentype');
    font-weight: 900; /* Black */
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'YekanSans';
    src: url('/assets/fonts/YekanSans-ExtraBlack.woff2') format('woff2'),
         url('/assets/fonts/YekanSans-ExtraBlack.woff') format('woff'),
         url('/assets/fonts/YekanSans-ExtraBlack.ttf') format('truetype'),
         url('/assets/fonts/YekanSans-ExtraBlack.otf') format('opentype');
    font-weight: 950; /* Extra Black */
    font-style: normal;
    font-display: swap;
}

:root{
    --brand:#0047ab;
    --glass-bg: rgba(255,255,255,0.12);
    --glass-stroke: rgba(255,255,255,0.25);
    --page-bg: radial-gradient(1200px 800px at 80% -10%, #0047ab22, transparent 60%),
               radial-gradient(900px 700px at -10% 100%, #0ea5e922, transparent 60%),
               linear-gradient(180deg, #0b1020, #0a0f1a 70%);
    --text:#e7eefc;
    --muted:#b9c6e0;
}
*{ box-sizing: border-box; }
html, body {
    height: 100%;
    margin: 0;
    font-family: "YekanSans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: var(--page-bg);
    color: var(--text);
}
a{ color: var(--brand); }

.shell{
    height: 100%;
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 16px;
    padding: 24px;
}

.glass{
    background: var(--glass-bg);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border: 1px solid var(--glass-stroke);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.35);
}

.header{
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
}
.logo{
    width: 36px; height: 36px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--brand), #002b65);
    display: inline-flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700;
    box-shadow: 0 6px 18px rgba(0,71,171,0.45), inset 0 0 0 1px rgba(255,255,255,0.35);
}
.title{ font-weight: 700; }
.subtitle{ color: var(--muted); font-size: 13px; }

.chat{
    display: grid;
    grid-template-rows: 1fr auto;
    overflow: hidden;
}

.messages{
    padding: 18px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #6b85b8 transparent;
}
.msg{
    max-width: 80%;
    margin: 10px 0;
    padding: 12px 14px;
    border-radius: 16px;
    line-height: 1.7;
    border: 1px solid rgba(255,255,255,0.15);
    text-align: justify;
}
.msg.user{
    margin-right: auto;
    background: linear-gradient(135deg, rgba(0,71,171,0.55), rgba(0,71,171,0.35));
    box-shadow: 0 10px 18px rgba(0,71,171,0.25) inset, 0 6px 18px rgba(0,0,0,0.2);
}
.msg.bot{
    background: rgba(255,255,255,0.06);
}
.msg .meta{
    font-size: 11px;
    color: var(--muted);
    margin-top: 6px;
    text-align: left;
}

.composer{
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    padding: 14px;
    border-top: 1px solid var(--glass-stroke);
    background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
}
.input{
    width: 100%;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.18);
    background: rgba(255,255,255,0.12);
    color: var(--text);
    outline: none;
    transition: box-shadow .2s, border-color .2s;
    font-family: "YekanSans";
}
.input::placeholder{ color:#9eb0d1; }
.input:focus{
    box-shadow: 0 0 0 4px rgba(0,71,171,0.25);
    border-color: rgba(0,71,171,0.6);
}
.send{
    padding: 0 18px;
    min-width: 110px;
    border: none;
    border-radius: 14px;
    font-weight: 700;
    background: linear-gradient(135deg, #002b65, var(--brand));
    color: #fff;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0,71,171,0.35);
    transition: transform .08s ease, box-shadow .2s ease, filter .2s ease;
    font-family: "YekanSans";
}
.send:disabled{
    opacity: .6; cursor: not-allowed; filter: grayscale(.2);
}
.send:active{ transform: translateY(1px); }

.modal-backdrop{
    position: fixed; inset: 0; z-index: 60;
    background: radial-gradient(1200px 600px at 20% -10%, #0047ab33, transparent 60%),
                rgba(0,0,0,0.55);
    display: none;
    backdrop-filter: blur(3px);
}
.modal{
    position: fixed; inset: 0; z-index: 70;
    display: none; align-items: center; justify-content: center; padding: 24px;
}
.modal .card{
    width: 100%; max-width: 480px;
    padding: 20px;
    margin: auto;
}
.modal h3{ margin: 0 0 6px 0; }
.modal p{ margin: 4px 0 16px 0; color: var(--muted); }
.row{ display: grid; gap: 10px; margin-bottom: 12px; }
.otp{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    direction: ltr;
}
.otp input{
    text-align: center; font-size: 20px; font-weight: 700;
    padding: 14px 0;
}
.btn{
    background: linear-gradient(135deg, #002b65, var(--brand));
    border: none; border-radius: 12px; color: #fff; font-weight: 700;
    padding: 12px 16px; cursor: pointer;
    font-family: "YekanSans";
}
.btn:disabled{ opacity:.6; cursor:not-allowed; }

.hint{ font-size: 12px; color: var(--muted); }
.error{ color: #ffb0b0; font-size: 13px; margin-top: 6px; }
.success{ color: #b4ffb4; font-size: 13px; margin-top: 6px; }

.typing{ display: inline-block; min-width: 1.5em; }
.dot{ display:inline-block; width:6px; height:6px; border-radius:50%; background:#cfe0ff; margin:0 1px; opacity:.5; animation: blink 1.2s infinite; }
.dot:nth-child(2){ animation-delay: .2s; }
.dot:nth-child(3){ animation-delay: .4s; }
@keyframes blink{ 0%,80%,100%{opacity:.2} 40%{opacity:1} }

@media (max-width: 640px){
    .msg{ max-width: 92%; }
    .send{ min-width: 88px; }
}