/**
 * SineDay Wave - Premium Dark Theme Styles
 * Mobile-first, iPhone-native aesthetic
 */

/* ================================
   CSS Variables & Reset
   ================================ */

:root {
  /* Colors */
  --color-bg: #05060A;
  --color-bg-secondary: #090B12;
  --color-text-primary: #F5F7FF;
  --color-text-secondary: rgba(245, 247, 255, 0.72);
  --color-text-muted: rgba(245, 247, 255, 0.50);
  --color-accent: #7AA7FF;
  --color-accent-rgb: 122, 167, 255;

  /* Glass morphism */
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-blur: 20px;

  /* Spacing */
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Transitions */
  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --duration-normal: 300ms;
  --duration-slow: 600ms;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-system);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
}

/* ================================
   Background Image Layer
   ================================ */

.background-image-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.background-image-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  filter: blur(6px) brightness(0.6);
  opacity: 0;
  transition: opacity 800ms var(--ease-out);
}

/* ================================
   Top Bar
   ================================ */

.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-top: var(--safe-area-top);
  pointer-events: none;
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  pointer-events: auto;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.top-bar-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  -webkit-tap-highlight-color: transparent;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-text-primary);
}

.icon-btn:active {
  transform: scale(0.96);
}

/* ================================
   Main Content
   ================================ */

.main-content {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  z-index: 1;
  padding-top: calc(52px + var(--safe-area-top));
  padding-bottom: 600px; /* Extra space to allow scrolling to email card */
  overflow-y: auto;
  overflow-x: hidden;
}

/* ================================
   Wave Canvas
   ================================ */

.wave-container {
  flex: 1;
  min-height: 55vh;
  max-height: 65vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.wave-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ================================
   Input Container
   ================================ */

.input-container {
  position: fixed;
  /* Position close to bottom to leave space at top for wave graphic */
  bottom: calc(20px + var(--safe-area-bottom));
  left: 0;
  right: 0;
  z-index: 50;
  padding: 0 20px 20px;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--duration-slow) var(--ease-out);
}

.input-container.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Email Signup Card */
.email-card {
  position: relative;
  width: 100%;
  z-index: 45;
  padding: 0 20px calc(20px + var(--safe-area-bottom));
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--duration-slow) var(--ease-out);
  margin-top: 20px;
}

/* When input is visible, email card is in normal flow (appears on scroll) */
.email-card:not(.results-shown) {
  position: relative;
  padding: 0 20px calc(20px + var(--safe-area-bottom));
  margin-top: 40px;
  margin-bottom: 40px;
}

/* When results are shown, position email card in normal flow at bottom */
.email-card.results-shown {
  position: relative;
  bottom: auto;
  top: auto;
  padding: 0 20px calc(40px + var(--safe-area-bottom));
  margin-top: 20px;
  z-index: 45;
}

.email-card.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.input-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 24px;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  max-width: 460px;
  margin: 0 auto;
}

.input-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.date-input {
  width: 100%;
  padding: 14px 16px;
  font-size: 17px;
  font-family: var(--font-system);
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  outline: none;
  transition: all var(--duration-normal) var(--ease-out);
  -webkit-appearance: none;
  appearance: none;
  color-scheme: dark;
}

.date-input:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(var(--color-accent-rgb), 0.15);
}

.calculate-btn {
  width: 100%;
  padding: 14px 24px;
  margin-top: 16px;
  font-size: 17px;
  font-weight: 600;
  font-family: var(--font-system);
  color: var(--color-bg);
  background: var(--color-accent);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  -webkit-tap-highlight-color: transparent;
  min-height: 44px;
}

.calculate-btn:hover {
  background: rgba(var(--color-accent-rgb), 0.9);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(var(--color-accent-rgb), 0.3);
}

.calculate-btn:active {
  transform: translateY(0);
}

/* ================================
   Result Card
   ================================ */

.result-card {
  position: relative;
  width: 100%;
  z-index: 50;
  padding: 0 20px 20px;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--duration-slow) var(--ease-out);
  margin-top: auto;
}

.result-card.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.result-content {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 32px 28px;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  max-width: 460px;
  margin: 0 auto;
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.result-content:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.day-number {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  line-height: 1.1;
}

.duck-image {
  width: 120px;
  height: 120px;
  object-fit: contain;
  margin: 16px auto;
  display: block;
  border-radius: 12px;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.swipe-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 0 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  opacity: 0.6;
  animation: swipeHintPulse 2s ease-in-out infinite;
}

.swipe-hint svg {
  width: 20px;
  height: 20px;
  opacity: 0.7;
}

@keyframes swipeHintPulse {
  0%, 100% {
    opacity: 0.6;
    transform: translateY(0);
  }
  50% {
    opacity: 0.9;
    transform: translateY(-4px);
  }
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-8px);
  }
  75% {
    transform: translateX(8px);
  }
}

.day-phase {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.day-description {
  font-size: 17px;
  font-weight: 450;
  line-height: 1.35;
  color: var(--color-text-secondary);
}

/* ================================
   Day Image Card
   ================================ */

.day-image-card {
  position: relative;
  width: 100%;
  z-index: 45;
  padding: 0 20px calc(40px + var(--safe-area-bottom));
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--duration-slow) var(--ease-out);
  margin-top: 20px;
}

.day-image-card.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.day-image-content {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 0;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  max-width: 460px;
  margin: 0 auto;
  overflow: hidden;
}

.day-full-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 20px;
}

/* ================================
   Responsive Design
   ================================ */

@media (min-width: 768px) {
  .top-bar-content {
    padding: 20px 32px;
  }

  .input-container,
  .result-card {
    padding-left: 32px;
    padding-right: 32px;
  }

  .email-card:not(.results-shown) {
    padding-left: 32px;
    padding-right: 32px;
  }

  .email-card.results-shown {
    padding-left: 32px;
    padding-right: 32px;
  }

  .day-number {
    font-size: 42px;
  }
}

/* Desktop: Center and constrain */
@media (min-width: 1024px) {
  .main-content {
    max-width: 1200px;
    margin: 0 auto;
  }

  .wave-container {
    max-width: 800px;
    margin: 0 auto;
  }
}

/* Landscape mobile: Adjust layout */
@media (max-height: 600px) and (orientation: landscape) {
  .wave-container {
    min-height: 40vh;
    max-height: 50vh;
  }

  .input-card,
  .result-content {
    padding: 20px 24px;
  }

  .day-number {
    font-size: 32px;
  }
}

/* ================================
   Accessibility: Reduced Motion
   ================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .background-image-layer {
    transition: opacity 200ms ease;
  }

  .input-container,
  .result-card {
    transition: opacity 200ms ease;
  }
}

/* ================================
   High Contrast Mode
   ================================ */

@media (prefers-contrast: high) {
  :root {
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.25);
  }

  .icon-btn {
    background: rgba(255, 255, 255, 0.15);
  }

  .date-input {
    border-width: 2px;
  }
}

/* ================================
   Dark Mode (system)
   ================================ */

@media (prefers-color-scheme: dark) {
  /* Already dark by default */
}

/* ================================
   Focus Visible (Keyboard Nav)
   ================================ */

*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

button:focus-visible {
  outline-offset: 4px;
}

/* ================================
   Print Styles
   ================================ */

@media print {
  .top-bar,
  .icon-btn,
  .input-container,
  .calculate-btn {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .result-card {
    position: static;
    opacity: 1;
    transform: none;
  }
}

/* ================================
   Loading State
   ================================ */

body.loading {
  cursor: wait;
}

/* ================================
   Utilities
   ================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.hidden {
  display: none !important;
}