feat: add breathing exercises tool

src/components/tools/about.astro

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+---
+import { Container } from '../container';
+
+interface Props {
+  text: string;
+}
+
+const { text } = Astro.props;
+---
+
+<section class="about">
+  <Container tight>
+    <h2 class="title">About this tool</h2>
+    <p class="text">{text}</p>
+  </Container>
+</section>
+
+<style>
+  .about {
+    margin-top: 75px;
+
+    & .title {
+      margin-bottom: 8px;
+      font-family: var(--font-heading);
+      font-size: var(--font-md);
+      font-weight: 600;
+    }
+
+    & .text {
+      color: var(--color-foreground-subtle);
+    }
+  }
+</style>

src/components/tools/breathing/breathing.module.css

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+.exercise {
+  position: relative;
+  z-index: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 75px 0;
+  margin-top: 12px;
+  background-color: var(--color-neutral-50);
+  border: 1px solid var(--color-neutral-200);
+  border-radius: 8px;
+
+  & .phase {
+    font-family: var(--font-display);
+    font-size: var(--font-lg);
+    font-weight: 600;
+  }
+
+  & .circle {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    z-index: -1;
+    height: 55%;
+    aspect-ratio: 1 / 1;
+    background-image: radial-gradient(
+      var(--color-neutral-50),
+      var(--color-neutral-100)
+    );
+    border: 1px solid var(--color-neutral-200);
+    border-radius: 50%;
+    transform: translate(-50%, -50%);
+  }
+}
+
+.selectBox {
+  width: 100%;
+  min-width: 0;
+  height: 45px;
+  padding: 0 12px;
+  margin-top: 8px;
+  font-size: var(--font-sm);
+  color: var(--color-foreground);
+  background-color: var(--color-neutral-100);
+  border: 1px solid var(--color-neutral-200);
+  border-radius: 8px;
+}

src/components/tools/breathing/breathing.tsx

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+import { useState, useEffect } from 'react';
+import { motion } from 'framer-motion';
+
+import { Container } from '@/components/container';
+
+import styles from './breathing.module.css';
+
+type Exercise = 'Box Breathing' | 'Resonant Breathing' | '4-7-8 Breathing';
+type Phase = 'inhale' | 'exhale' | 'holdInhale' | 'holdExhale';
+
+export function Breathing() {
+  const [selectedExercise, setSelectedExercise] =
+    useState<Exercise>('4-7-8 Breathing');
+
+  const getAnimationPhases = (
+    exercise: Exercise,
+  ): Array<'inhale' | 'holdInhale' | 'exhale' | 'holdExhale'> => {
+    switch (exercise) {
+      case 'Box Breathing':
+        return ['inhale', 'holdInhale', 'exhale', 'holdExhale'];
+      case 'Resonant Breathing':
+        return ['inhale', 'exhale'];
+      case '4-7-8 Breathing':
+        return ['inhale', 'holdInhale', 'exhale'];
+      default:
+        return ['inhale', 'holdInhale', 'exhale', 'holdExhale'];
+    }
+  };
+
+  const getAnimationDurations = (exercise: Exercise) => {
+    switch (exercise) {
+      case 'Box Breathing':
+        return { exhale: 4, holdExhale: 4, holdInhale: 4, inhale: 4 };
+      case 'Resonant Breathing':
+        return { exhale: 5, inhale: 5 };
+      case '4-7-8 Breathing':
+        return { exhale: 8, holdInhale: 7, inhale: 4 };
+      default:
+        return { exhale: 4, holdExhale: 4, holdInhale: 4, inhale: 4 };
+    }
+  };
+
+  const getLabel = (phase: Phase) => {
+    switch (phase) {
+      case 'inhale':
+        return 'Inhale';
+      case 'exhale':
+        return 'Exhale';
+      default:
+        return 'Hold';
+    }
+  };
+
+  const [phase, setPhase] = useState<Phase>('inhale');
+  const [durations, setDurations] = useState(
+    getAnimationDurations(selectedExercise),
+  );
+
+  const animationVariants = {
+    exhale: {
+      transform: 'translate(-50%, -50%) scale(1)',
+      transition: { duration: durations.exhale },
+    },
+    holdExhale: {
+      transform: 'translate(-50%, -50%) scale(1)',
+      transition: { duration: durations.holdExhale || 4 },
+    },
+    holdInhale: {
+      transform: 'translate(-50%, -50%) scale(1.5)',
+      transition: { duration: durations.holdInhale || 4 },
+    },
+    inhale: {
+      transform: 'translate(-50%, -50%) scale(1.5)',
+      transition: { duration: durations.inhale },
+    },
+  };
+
+  useEffect(() => {
+    setDurations(getAnimationDurations(selectedExercise));
+  }, [selectedExercise]);
+
+  useEffect(() => {
+    const phases = getAnimationPhases(selectedExercise);
+
+    let phaseIndex = 0;
+
+    setPhase(phases[phaseIndex]);
+
+    const interval = setInterval(
+      () => {
+        phaseIndex = (phaseIndex + 1) % phases.length;
+
+        setPhase(phases[phaseIndex]);
+      },
+      (durations[phases[phaseIndex]] || 4) * 1000,
+    );
+
+    return () => clearInterval(interval);
+  }, [selectedExercise, durations]);
+
+  return (
+    <Container>
+      <div className={styles.exercise}>
+        <motion.div
+          animate={phase}
+          className={styles.circle}
+          key={selectedExercise}
+          variants={animationVariants}
+        />
+        <p className={styles.phase}>{getLabel(phase)}</p>
+      </div>
+
+      <select
+        className={styles.selectBox}
+        value={selectedExercise}
+        onChange={e => setSelectedExercise(e.target.value as Exercise)}
+      >
+        <option value="Box Breathing">Box Breathing</option>
+        <option value="Resonant Breathing">Resonant Breathing</option>
+        <option value="4-7-8 Breathing">4-7-8 Breathing</option>
+      </select>
+    </Container>
+  );
+}

src/components/tools/breathing/index.ts

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+export { Breathing } from './breathing';

src/components/tools/hero.astro

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+---
+import { Container } from '../container';
+
+interface Props {
+  desc: string;
+  title: string;
+}
+
+const { desc, title } = Astro.props;
+---
+
+<section class="hero">
+  <Container>
+    <img alt="Moodist Logo" class="logo" src="/logo.svg" />
+    <h1>{title}</h1>
+    <p class="desc">{desc}</p>
+    <p class="moodist">Part of <a href="/">Moodist</a></p>
+  </Container>
+</section>
+
+<style>
+  .hero {
+    padding: 75px 0;
+    text-align: center;
+
+    & .logo {
+      display: block;
+      width: 45px;
+      margin: 0 auto 16px;
+    }
+
+    h1 {
+      font-family: var(--font-display);
+      font-size: var(--font-lg);
+      font-weight: 600;
+    }
+
+    .desc {
+      margin-top: 4px;
+      color: var(--color-foreground-subtle);
+    }
+
+    .moodist {
+      margin-top: 16px;
+      font-size: var(--font-sm);
+      color: var(--color-foreground-subtle);
+
+      & a {
+        font-weight: 500;
+        color: var(--color-foreground);
+        text-decoration: none;
+      }
+    }
+  }
+</style>

src/pages/tools/breathing-exercises.astro

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+---
+import Layout from '@/layouts/layout.astro';
+
+import Donate from '@/components/donate.astro';
+import Hero from '@/components/tools/hero.astro';
+import Footer from '@/components/footer.astro';
+import About from '@/components/tools/about.astro';
+import { Breathing } from '@/components/tools/breathing';
+---
+
+<Layout title="Breathing Exercises Tool — Moodist">
+  <Donate />
+  <Hero desc="Simple breathing exercises." title="Breathing Exercises" />
+  <Breathing client:load />
+  <About
+    text="Experience calm and focus with our simple breathing exercise tool. Designed to guide your breath, it helps reduce stress, enhance relaxation, and improve mindfulness in just a few minutes a day."
+  />
+  <Footer />
+</Layout>