/* ============================================================
   HyperSevenSix — vanilla CSS, dark-first with light theme
   ============================================================ */

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

:root,
[data-theme="dark"]{
    --bg:#08080d;
    --surface:#101018;
    --surface-2:#181824;
    --surface-3:#20202e;
    --text:#e8e8f0;
    --text-dim:#8888a0;
    --text-muted:#55556a;
    --border:rgba(255,255,255,0.06);
    --border-strong:rgba(255,255,255,0.12);
    --accent:#6c5ce7;
    --accent-glow:#a78bfa;
    --accent-dark:#5a4bd6;
    --success:#00b894;
    --warning:#e17055;
    --transition:0.2s cubic-bezier(.25,.46,.45,.94);
}

[data-theme="light"]{
    --bg:#f5f5f7;
    --surface:#ffffff;
    --surface-2:#f0f0f4;
    --surface-3:#e6e6ec;
    --text:#1a1a2e;
    --text-dim:#555570;
    --text-muted:#8888a0;
    --border:rgba(0,0,0,0.08);
    --border-strong:rgba(0,0,0,0.16);
    --accent:#5b4cdb;
    --accent-glow:#6c5ce7;
    --accent-dark:#4a3bc0;
}

html{scroll-behavior:smooth;background:var(--bg);color:var(--text)}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--accent-glow);text-decoration:none}
a:hover{text-decoration:underline}
button{cursor:pointer;font-family:inherit}
input,select{font-family:inherit}

/* Header */
.site-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 2rem;border-bottom:1px solid var(--border)}
.logo{font-size:1.25rem;font-weight:700;letter-spacing:-.5px;color:var(--text)}
.logo span{color:var(--accent)}
.icon-btn{background:none;border:1px solid var(--border);border-radius:8px;width:38px;height:38px;display:flex;align-items:center;justify-content:center;color:var(--text-dim);transition:all var(--transition)}
.icon-btn:hover{color:var(--text);border-color:var(--border-strong)}

/* Tool nav */
.tool-nav{display:flex;flex-wrap:wrap;gap:.25rem;padding:.75rem 2rem;border-bottom:1px solid var(--border);background:var(--surface);overflow-x:auto}
.tool-tab{background:transparent;border:none;color:var(--text-dim);font-size:.9rem;font-weight:500;padding:.55rem 1.1rem;border-radius:8px;transition:all var(--transition);white-space:nowrap}
.tool-tab:hover{color:var(--text);background:var(--surface-2)}
.tool-tab.is-active{color:var(--text);background:var(--surface-2);box-shadow:inset 0 -2px 0 var(--accent)}

/* Main app area */
.app{flex:1;max-width:900px;width:100%;margin:0 auto;padding:3rem 1.5rem}

/* Panels */
.panel{display:none;animation:fadeIn .35s ease both}
.panel.is-active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

.panel-title{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;letter-spacing:-.5px;margin-bottom:.5rem}
.panel-lede{color:var(--text-dim);font-size:.95rem;line-height:1.7;max-width:600px;margin-bottom:2rem}
.panel-meta{color:var(--text-dim);font-size:.85rem;line-height:1.7;max-width:600px;margin:2rem auto 0;text-align:center}

/* Clock display */
.clock-display{text-align:center;padding:3rem 1rem 1.5rem}
.clock-time{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:clamp(3rem,12vw,7rem);font-weight:500;letter-spacing:-.02em;line-height:1;color:var(--text);text-shadow:0 0 60px rgba(108,92,231,.25)}
.clock-date{font-size:clamp(1rem,2.2vw,1.35rem);color:var(--text-dim);margin-top:1.25rem;font-weight:500}
.clock-tz{font-size:.8rem;color:var(--text-muted);margin-top:.35rem;letter-spacing:.05em;text-transform:uppercase}

.inline-controls{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;margin-top:2rem}

/* Big display (stopwatch, timer, pomodoro) */
.big-display{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:clamp(2.75rem,10vw,5.5rem);font-weight:500;letter-spacing:-.02em;line-height:1;color:var(--text);text-align:center;padding:2rem 0;text-shadow:0 0 60px rgba(108,92,231,.2)}
.big-display.is-warning{color:var(--warning);text-shadow:0 0 60px rgba(225,112,85,.3)}
.big-display.is-success{color:var(--success);text-shadow:0 0 60px rgba(0,184,148,.3)}

/* Controls row */
.controls{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap;margin-bottom:1.5rem}

/* Buttons */
.btn-primary,.btn-secondary,.btn-ghost,.btn-chip{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.7rem 1.6rem;border-radius:8px;font-size:.95rem;font-weight:600;border:none;cursor:pointer;transition:all var(--transition)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(108,92,231,.35)}
.btn-primary:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.btn-secondary{background:var(--surface-2);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover:not(:disabled){background:var(--surface-3);border-color:var(--border-strong)}
.btn-secondary:disabled{opacity:.4;cursor:not-allowed}
.btn-ghost{background:transparent;color:var(--text-dim);border:1px solid transparent}
.btn-ghost:hover{color:var(--text);background:var(--surface-2)}

/* Chip row */
.chip-row{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center;margin:1rem 0 1.5rem}
.btn-chip{padding:.45rem 1rem;font-size:.82rem;background:var(--surface-2);color:var(--text-dim);border:1px solid var(--border)}
.btn-chip:hover{color:var(--text);border-color:var(--accent);background:var(--surface-3)}

/* Inputs */
input[type="number"],select{background:var(--surface-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:.55rem .75rem;font-size:1rem;width:100%;transition:border-color var(--transition)}
input[type="number"]:focus,select:focus{outline:none;border-color:var(--accent)}

/* Timer inputs */
.timer-inputs{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;max-width:420px;margin:0 auto 1rem}
.timer-inputs label{font-size:.8rem;color:var(--text-dim);display:flex;flex-direction:column;gap:.35rem;font-weight:500;letter-spacing:.03em;text-transform:uppercase}

/* World clock */
.world-list{display:grid;gap:.75rem;margin-bottom:2rem}
.world-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 1.25rem;background:var(--surface);border:1px solid var(--border);border-radius:10px;transition:border-color var(--transition)}
.world-row:hover{border-color:var(--border-strong)}
.world-info{display:flex;flex-direction:column;gap:.15rem;min-width:0;flex:1}
.world-city{font-weight:600;font-size:.95rem;color:var(--text)}
.world-zone{font-size:.75rem;color:var(--text-muted)}
.world-time{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:1.35rem;font-weight:500;color:var(--text);white-space:nowrap}
.world-remove{background:none;border:none;color:var(--text-muted);width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:6px;transition:all var(--transition)}
.world-remove:hover{color:var(--warning);background:rgba(225,112,85,.1)}
.world-add{display:flex;gap:.5rem;flex-wrap:wrap}
.world-add select{flex:1;min-width:200px}

/* Lap list */
.lap-list{list-style:none;max-width:440px;margin:1.5rem auto 0;max-height:260px;overflow-y:auto;border:1px solid var(--border);border-radius:10px;background:var(--surface)}
.lap-list:empty{display:none}
.lap-list li{display:flex;justify-content:space-between;padding:.6rem 1rem;border-bottom:1px solid var(--border);font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.9rem}
.lap-list li:last-child{border-bottom:none}
.lap-list .lap-n{color:var(--text-dim)}
.lap-list .lap-t{color:var(--text);font-weight:500}

/* Pomodoro */
.pomo-phase{text-align:center;font-size:.85rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-glow);padding:.35rem 1rem;background:rgba(108,92,231,.1);border:1px solid rgba(108,92,231,.25);border-radius:100px;display:inline-block;margin:0 auto 1rem;position:relative;left:50%;transform:translateX(-50%)}
.pomo-phase.is-break{color:var(--success);background:rgba(0,184,148,.1);border-color:rgba(0,184,148,.25)}
.pomo-rounds{text-align:center;font-size:.85rem;color:var(--text-dim);margin-top:.5rem}
.pomo-rounds span{color:var(--text);font-weight:600}
.pomo-settings{max-width:500px;margin:2rem auto 0;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:1rem 1.25rem}
.pomo-settings summary{cursor:pointer;font-weight:600;font-size:.9rem;color:var(--text-dim);user-select:none}
.pomo-settings summary:hover{color:var(--text)}
.pomo-settings[open] summary{margin-bottom:1rem;color:var(--text)}
.pomo-settings-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem}
.pomo-settings-grid label{font-size:.75rem;color:var(--text-dim);display:flex;flex-direction:column;gap:.35rem;font-weight:500;letter-spacing:.03em;text-transform:uppercase}

/* Footer */
.site-footer{padding:2.5rem 2rem;text-align:center;border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem;margin-top:3rem}
.footer-line{margin-bottom:.5rem}
.footer-attribution{padding-top:1rem;background:linear-gradient(to right,transparent 35%,var(--border-strong) 35%,var(--border-strong) 65%,transparent 65%) top center / 100% 1px no-repeat;margin-top:.5rem}
.footer-attribution a{color:var(--accent-glow);font-weight:500}

/* Responsive */
@media(max-width:640px){
    .site-header{padding:1rem 1.25rem}
    .tool-nav{padding:.6rem 1.25rem;gap:.15rem}
    .tool-tab{padding:.5rem .8rem;font-size:.82rem}
    .app{padding:2rem 1.25rem}
    .timer-inputs{grid-template-columns:1fr 1fr}
    .timer-inputs label:last-child{grid-column:1/-1}
    .pomo-settings-grid{grid-template-columns:1fr}
    .site-footer{padding:2rem 1.25rem}
}

@media(max-width:400px){
    .world-row{flex-direction:column;align-items:flex-start;gap:.5rem}
    .world-time{align-self:flex-end}
    .controls .btn-primary,.controls .btn-secondary,.controls .btn-ghost{flex:1;min-width:0}
}