:root{--bg: #f5f5f0;--surface: #ffffff;--text: #2c2c2c;--text-muted: #8a8a80;--accent: #4a7c59;--accent-light: #e8f0eb;--break-accent: #5b7fa5;--break-light: #e6eef5;--border: #e0e0d8;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .07), 0 2px 4px rgba(0, 0, 0, .04);--radius: 12px;--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, SFMono-Regular, Menlo, monospace}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem 1rem;gap:1.5rem}.timer-container{display:flex;flex-direction:column;align-items:center;gap:1.75rem;background:var(--surface);padding:2.5rem 2rem;border-radius:var(--radius);box-shadow:var(--shadow-md);width:100%;max-width:380px}.session-toggle{display:flex;gap:.25rem;background:var(--bg);padding:4px;border-radius:8px}.toggle-btn{border:none;background:transparent;padding:.5rem 1.25rem;border-radius:6px;font-size:.85rem;font-weight:500;color:var(--text-muted);cursor:pointer;transition:all .2s ease;font-family:var(--font)}.toggle-btn.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}.toggle-btn:not(.active):hover{color:var(--text)}.timer-ring-wrapper{position:relative;width:220px;height:220px}.timer-ring{width:100%;height:100%}.ring-bg{stroke:var(--border)}.ring-progress{stroke:var(--accent);transition:stroke-dashoffset .3s ease,stroke .3s ease}.break-active .ring-progress{stroke:var(--break-accent)}.timer-display{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.25rem}.timer-time{font-family:var(--mono);font-size:3rem;font-weight:300;letter-spacing:.04em;line-height:1}.timer-label{font-size:.8rem;text-transform:uppercase;letter-spacing:.12em;color:var(--text-muted);font-weight:500}.controls{display:flex;gap:.75rem}.btn{border:none;padding:.65rem 1.75rem;border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .15s ease;font-family:var(--font)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{filter:brightness(1.08);box-shadow:var(--shadow)}.btn-secondary{background:var(--accent-light);color:var(--accent)}.btn-secondary:hover{filter:brightness(.96)}.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn-ghost:hover{color:var(--text);border-color:#ccc}.session-counter{display:flex;align-items:baseline;gap:.5rem}.counter-number{font-size:1.75rem;font-weight:600;color:var(--accent);font-family:var(--mono);line-height:1}.counter-label{font-size:.8rem;color:var(--text-muted)}.settings-section{width:100%;max-width:380px;display:flex;flex-direction:column;align-items:center}.settings-toggle{background:none;border:none;font-size:.8rem;color:var(--text-muted);cursor:pointer;padding:.4rem .75rem;border-radius:6px;font-family:var(--font);transition:color .15s}.settings-toggle:hover{color:var(--text)}.settings-panel{margin-top:.75rem;background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem;width:100%;display:flex;flex-direction:column;gap:.75rem}.setting-row{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text)}.setting-row input{width:64px;padding:.4rem .5rem;border:1px solid var(--border);border-radius:6px;font-size:.85rem;text-align:center;font-family:var(--mono);background:var(--bg);color:var(--text);outline:none;transition:border-color .15s}.setting-row input:focus{border-color:var(--accent)}@media(max-width:440px){.timer-container{padding:2rem 1.25rem}.timer-ring-wrapper{width:180px;height:180px}.timer-time{font-size:2.4rem}.btn{padding:.55rem 1.25rem;font-size:.85rem}}