@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

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

:root{
    --bg:#0f0f13;
    --card:#1a1a2e;
    --card-hover:#222238;
    --border:rgba(255,255,255,0.06);
    --text:#e4e4e7;
    --text-secondary:#a1a1aa;
    --accent:#f97316;
    --accent2:#ea580c;
    --accent3:#dc2626;
    --gradient:linear-gradient(135deg,#f97316,#ea580c,#dc2626);
    --radius:0.75rem;
    --radius-lg:1rem;
}

body{
    font-family:'Inter',system-ui,-apple-system,sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.6;
    min-height:100vh;
    -webkit-font-smoothing:antialiased;
}

.container{max-width:900px;margin:0 auto;padding:0 1.5rem}

.site-header{
    border-bottom:1px solid var(--border);
    padding:1rem 0;
    background:rgba(15,15,19,0.9);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    position:sticky;top:0;z-index:100;
}
.site-header .container{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:0.5rem;text-decoration:none;color:var(--text);font-weight:800;font-size:1.15rem}
.logo-icon{
    font-size:1.4rem;
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
nav{display:flex;gap:1.25rem}
nav a{color:var(--text-secondary);text-decoration:none;font-size:0.9rem;font-weight:500;transition:color .2s}
nav a:hover{color:var(--text)}

.ad-slot{
    background:var(--card);
    border:1px dashed var(--border);
    border-radius:var(--radius);
    min-height:90px;
    display:flex;align-items:center;justify-content:center;
    color:var(--text-secondary);font-size:0.8rem;
    margin:1.5rem 0;
    overflow:hidden;
}

.hero{text-align:center;padding:3rem 0 1rem}
.hero h1{
    font-size:2.2rem;font-weight:800;line-height:1.2;margin-bottom:0.75rem;
    background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero p{color:var(--text-secondary);font-size:1.05rem;max-width:560px;margin:0 auto}

.card{
    background:var(--card);
    border:1px solid var(--border);
    border-radius:var(--radius-lg);
    padding:2rem;
    margin-bottom:1.5rem;
    transition:border-color .2s;
}
.card:hover{border-color:rgba(249,115,22,0.15)}

/* Timer Display */
.timer-container{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:1.5rem;
    padding:2rem 0;
}

.timer-circle{
    position:relative;
    width:280px;
    height:280px;
}

.timer-circle svg{
    width:100%;
    height:100%;
    transform:rotate(-90deg);
}

.timer-circle .track{
    fill:none;
    stroke:rgba(255,255,255,0.05);
    stroke-width:8;
}

.timer-circle .progress{
    fill:none;
    stroke:url(#timerGradient);
    stroke-width:8;
    stroke-linecap:round;
    transition:stroke-dashoffset 0.5s ease;
}

.timer-display{
    position:absolute;
    top:50%;left:50%;
    transform:translate(-50%,-50%);
    text-align:center;
}

.timer-time{
    font-family:'JetBrains Mono',monospace;
    font-size:3.5rem;
    font-weight:700;
    letter-spacing:2px;
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}

.timer-label{
    font-size:0.85rem;
    color:var(--text-secondary);
    text-transform:uppercase;
    letter-spacing:2px;
    margin-top:0.25rem;
}

/* Mode Tabs */
.mode-tabs{
    display:flex;
    gap:0.5rem;
    margin-bottom:1.5rem;
    justify-content:center;
}

.mode-tab{
    background:rgba(255,255,255,0.05);
    border:1px solid var(--border);
    border-radius:2rem;
    padding:0.5rem 1.25rem;
    color:var(--text-secondary);
    font-size:0.85rem;
    font-weight:600;
    cursor:pointer;
    transition:all .2s;
    font-family:'Inter',sans-serif;
}

.mode-tab:hover{
    background:rgba(249,115,22,0.1);
    color:var(--text);
}

.mode-tab.active{
    background:var(--gradient);
    color:#fff;
    border-color:transparent;
}

/* Controls */
.timer-controls{
    display:flex;
    gap:0.75rem;
    justify-content:center;
    margin-top:0.5rem;
}

.btn{
    padding:0.75rem 2rem;
    border-radius:2rem;
    border:none;
    font-family:'Inter',sans-serif;
    font-weight:600;
    font-size:0.95rem;
    cursor:pointer;
    transition:all .2s;
}

.btn-primary{
    background:var(--gradient);
    color:#fff;
    min-width:140px;
}
.btn-primary:hover{opacity:0.9;transform:translateY(-1px)}

.btn-secondary{
    background:rgba(255,255,255,0.06);
    color:var(--text-secondary);
    border:1px solid var(--border);
}
.btn-secondary:hover{background:rgba(255,255,255,0.1);color:var(--text)}

/* Session Counter */
.session-info{
    display:flex;
    gap:2rem;
    justify-content:center;
    margin-top:1.5rem;
    padding-top:1.5rem;
    border-top:1px solid var(--border);
}

.session-stat{
    text-align:center;
}

.session-stat .value{
    font-family:'JetBrains Mono',monospace;
    font-size:1.5rem;
    font-weight:700;
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}

.session-stat .label{
    font-size:0.75rem;
    color:var(--text-secondary);
    text-transform:uppercase;
    letter-spacing:1px;
    margin-top:0.15rem;
}

/* Settings Panel */
.settings-panel{
    margin-top:1.5rem;
}

.settings-toggle{
    display:flex;
    align-items:center;
    gap:0.5rem;
    background:none;
    border:none;
    color:var(--text-secondary);
    font-family:'Inter',sans-serif;
    font-size:0.85rem;
    font-weight:600;
    cursor:pointer;
    padding:0.5rem 0;
    transition:color .2s;
}
.settings-toggle:hover{color:var(--text)}
.settings-toggle .arrow{transition:transform .2s}
.settings-toggle .arrow.open{transform:rotate(180deg)}

.settings-content{
    display:none;
    margin-top:1rem;
    padding:1.5rem;
    background:rgba(255,255,255,0.02);
    border-radius:var(--radius);
    border:1px solid var(--border);
}
.settings-content.show{display:block}

.settings-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1rem;
}

.setting-item label{
    display:block;
    font-size:0.8rem;
    color:var(--text-secondary);
    margin-bottom:0.35rem;
    font-weight:600;
}

.setting-item input{
    width:100%;
    background:var(--bg);
    border:1px solid var(--border);
    border-radius:var(--radius);
    padding:0.6rem 0.75rem;
    color:var(--text);
    font-family:'JetBrains Mono',monospace;
    font-size:0.9rem;
    text-align:center;
    transition:border-color .2s;
}
.setting-item input:focus{outline:none;border-color:var(--accent)}

.btn-save-settings{
    margin-top:1rem;
    background:var(--gradient);
    color:#fff;
    border:none;
    padding:0.6rem 1.5rem;
    border-radius:var(--radius);
    font-family:'Inter',sans-serif;
    font-weight:600;
    font-size:0.85rem;
    cursor:pointer;
    transition:opacity .2s;
}
.btn-save-settings:hover{opacity:0.9}

/* Content Section */
.content-section{margin-top:2rem}
.content-section h2{
    font-size:1.4rem;font-weight:700;margin-bottom:1rem;
    background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.content-section h3{font-size:1.05rem;font-weight:700;margin:1.25rem 0 0.5rem;color:var(--text)}
.content-section p{color:var(--text-secondary);margin-bottom:0.75rem;font-size:0.95rem}
.content-section ul{color:var(--text-secondary);margin:0.5rem 0 1rem 1.5rem;font-size:0.95rem}
.content-section li{margin-bottom:0.35rem}

/* Footer */
.site-footer{
    border-top:1px solid var(--border);
    padding:2rem 0;
    margin-top:3rem;
    text-align:center;
}
.site-footer .container{display:flex;flex-direction:column;align-items:center;gap:0.75rem}
.site-footer p{color:var(--text-secondary);font-size:0.8rem}
.site-footer nav{display:flex;gap:1.25rem}
.site-footer nav a{color:var(--text-secondary);text-decoration:none;font-size:0.8rem;transition:color .2s}
.site-footer nav a:hover{color:var(--text)}

.hidden{display:none!important}

@media(max-width:640px){
    .hero h1{font-size:1.6rem}
    .timer-circle{width:220px;height:220px}
    .timer-time{font-size:2.5rem}
    .settings-grid{grid-template-columns:1fr}
    .mode-tabs{flex-wrap:wrap}
    .session-info{gap:1rem}
    .container{padding:0 1rem}
}