/**
 * Cirkles OTP Login — Frontend Styles
 *
 * Design language: WhatsApp-native green, clean card panel,
 * individual OTP digit boxes, smooth micro-interactions.
 *
 * @package CirklesOTPLogin
 */

/* ── Variables ─────────────────────────────────────────────────────────────── */
:root {
  --col-green:        #25D366;
  --col-green-dark:   #128C7E;
  --col-green-deep:   #075E54;
  --col-green-pale:   #DCF8C6;
  --col-green-tint:   #f0faf4;
  --col-surface:      #ffffff;
  --col-border:       #e4e9ee;
  --col-border-focus: #25D366;
  --col-text:         #1a2332;
  --col-text-muted:   #6b7a8d;
  --col-error:        #e53e3e;
  --col-error-bg:     #fff5f5;
  --col-success:      #38a169;
  --col-radius:       14px;
  --col-radius-sm:    8px;
  --col-shadow:       0 4px 24px rgba(0, 0, 0, .08), 0 1px 4px rgba(0, 0, 0, .04);
  --col-shadow-focus: 0 0 0 3px rgba(37, 211, 102, .22);
  --col-transition:   all .22s cubic-bezier(.4, 0, .2, 1);
  --col-font:         -apple-system, 'Segoe UI', system-ui, sans-serif;
}

/* ── Wrapper ────────────────────────────────────────────────────────────────── */
.col-wrap {
  font-family: var(--col-font);
  margin-bottom: 28px;
  position: relative;
}

.col-wrap--standalone {
  max-width: 420px;
  margin: 32px auto;
  padding: 0 16px;
}

/* ── Tab bar ────────────────────────────────────────────────────────────────── */
.col-tabs {
  display: flex;
  gap: 0;
  background: #f5f7f9;
  border-radius: var(--col-radius) var(--col-radius) 0 0;
  border: 1px solid var(--col-border);
  border-bottom: none;
  overflow: hidden;
}

.col-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 13px 16px;
  background: transparent;
  border: none;
  font-size: .875rem;
  font-weight: 500;
  font-family: var(--col-font);
  color: var(--col-text-muted);
  cursor: pointer;
  transition: var(--col-transition);
  position: relative;
  outline: none;
}

.col-tab:first-child {
  border-radius: var(--col-radius) 0 0 0;
}
.col-tab:last-child {
  border-radius: 0 var(--col-radius) 0 0;
}

.col-tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--col-green);
  transform: scaleX(0);
  transition: transform .22s cubic-bezier(.4, 0, .2, 1);
}

.col-tab--active {
  color: var(--col-green-dark);
  background: var(--col-surface);
  font-weight: 600;
}

.col-tab--active::after {
  transform: scaleX(1);
}

.col-tab:hover:not(.col-tab--active) {
  color: var(--col-text);
  background: rgba(37, 211, 102, .05);
}

.col-tab-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ── Panel card ─────────────────────────────────────────────────────────────── */
.col-panel {
  background: var(--col-surface);
  border: 1px solid var(--col-border);
  border-radius: 0 0 var(--col-radius) var(--col-radius);
  padding: 26px 24px 22px;
  animation: col-fadeIn .28s ease;
}

/* Standalone: full rounded card */
.col-wrap--standalone .col-panel {
  border-radius: var(--col-radius);
  box-shadow: var(--col-shadow);
}

/* ── WhatsApp header strip ───────────────────────────────────────────────────── */
.col-wa-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--col-green-dark);
  background: var(--col-green-tint);
  border: 1px solid rgba(37, 211, 102, .2);
  border-radius: var(--col-radius-sm);
  padding: 9px 12px;
  margin-bottom: 20px;
  letter-spacing: .01em;
}

.col-wa-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--col-green);
  box-shadow: 0 0 0 3px rgba(37, 211, 102, .25);
  animation: col-pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

/* ── Steps ──────────────────────────────────────────────────────────────────── */
.col-step {
  animation: col-fadeIn .24s ease;
}

.col-step[hidden] {
  display: none;
}

/* ── Field ──────────────────────────────────────────────────────────────────── */
.col-field {
  margin-bottom: 18px;
}

.col-label {
  display: block;
  font-size: .82rem;
  font-weight: 600;
  color: var(--col-text);
  margin-bottom: 7px;
  letter-spacing: .01em;
}

.col-hint {
  font-weight: 400;
  color: var(--col-text-muted);
  font-size: .78rem;
  margin-left: 4px;
}

/* ── Phone input ─────────────────────────────────────────────────────────────── */
.col-input-wrap {
  position: relative;
}

.col-input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 17px;
  height: 17px;
  color: var(--col-text-muted);
  pointer-events: none;
  transition: color .18s ease;
}

.col-input {
  width: 100%;
  padding: 11px 14px 11px 40px !important;
  border: 1.5px solid var(--col-border);
  border-radius: var(--col-radius-sm);
  font-size: .925rem;
  font-family: var(--col-font);
  color: var(--col-text);
  background: #fafbfc;
  outline: none;
  transition: var(--col-transition);
  box-sizing: border-box;
  -webkit-appearance: none;
}

.col-input:focus {
  border-color: var(--col-border-focus);
  background: #fff;
  box-shadow: var(--col-shadow-focus);
}

.col-input:focus + .col-input-icon,
.col-input-wrap:focus-within .col-input-icon {
  color: var(--col-green);
}

.col-input.col-input--error {
  border-color: var(--col-error);
  background: var(--col-error-bg);
  animation: col-shake .38s ease;
}

/* ── Error text ─────────────────────────────────────────────────────────────── */
.col-error {
  display: block;
  font-size: .78rem;
  color: var(--col-error);
  margin-top: 5px;
  min-height: 18px;
  line-height: 1.4;
}

/* ── OTP digit boxes ────────────────────────────────────────────────────────── */
.col-otp-row {
  display: flex;
  gap: 9px;
  justify-content: flex-start;
  margin-top: 2px;
}

.col-otp-box {
  width: 48px;
  height: 56px;
  border: 1.5px solid var(--col-border);
  border-radius: 10px;
  text-align: center;
  font-size: 1.375rem;
  font-weight: 700;
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  color: var(--col-text);
  background: #fafbfc;
  outline: none;
  cursor: text;
  transition: var(--col-transition);
  caret-color: var(--col-green);
  -webkit-appearance: none;
}

.col-otp-box:focus {
  border-color: var(--col-green);
  background: #fff;
  box-shadow: var(--col-shadow-focus);
  transform: translateY(-1px) scale(1.03);
}

.col-otp-box.col-otp-box--filled {
  border-color: var(--col-green);
  background: var(--col-green-tint);
  color: var(--col-green-deep);
}

.col-otp-box.col-otp-box--error {
  border-color: var(--col-error);
  background: var(--col-error-bg);
  animation: col-shake .38s ease;
}

/* Responsive OTP boxes */
@media (max-width: 400px) {
  .col-otp-box {
    width: 40px;
    height: 48px;
    font-size: 1.2rem;
    border-radius: 8px;
  }
  .col-otp-row {
    gap: 7px;
  }
}

@media (max-width: 340px) {
  .col-otp-box {
    width: 36px;
    height: 44px;
    font-size: 1.1rem;
  }
  .col-otp-row {
    gap: 5px;
  }
}

/* ── Buttons ─────────────────────────────────────────────────────────────────── */
.col-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 13px 20px;
  border: none;
  border-radius: var(--col-radius-sm);
  font-size: .925rem;
  font-weight: 600;
  font-family: var(--col-font);
  cursor: pointer;
  outline: none;
  transition: var(--col-transition);
  position: relative;
  overflow: hidden;
  letter-spacing: .01em;
}

.col-btn--primary {
  background: linear-gradient(135deg, var(--col-green) 0%, var(--col-green-dark) 100%);
  color: #fff;
  box-shadow: 0 3px 12px rgba(37, 211, 102, .35);
}

.col-btn--primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #29d96b 0%, #0d7a72 100%);
  box-shadow: 0 5px 18px rgba(37, 211, 102, .42);
  transform: translateY(-1px);
}

.col-btn--primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(37, 211, 102, .3);
}

.col-btn:disabled,
.col-btn.col-btn--loading {
  opacity: .72;
  cursor: not-allowed;
  transform: none !important;
}

/* ── Spinner ─────────────────────────────────────────────────────────────────── */
.col-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, .4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: col-spin .7s linear infinite;
  flex-shrink: 0;
}

.col-btn--loading .col-btn-label {
  opacity: .8;
}

.col-btn--loading .col-spinner {
  display: block;
}

/* ── Sent banner ──────────────────────────────────────────────────────────────── */
.col-sent-banner {
  display: flex;
  align-items: center;
  gap: 9px;
  background: var(--col-green-tint);
  border: 1px solid rgba(37, 211, 102, .25);
  border-radius: var(--col-radius-sm);
  padding: 10px 14px;
  margin-bottom: 20px;
  font-size: .85rem;
  color: var(--col-green-dark);
  font-weight: 500;
}

.col-sent-banner svg {
  width: 16px;
  height: 16px;
  stroke: var(--col-green-dark);
  flex-shrink: 0;
}

.col-sent-banner strong {
  font-weight: 700;
  color: var(--col-green-deep);
}

/* ── Resend row ──────────────────────────────────────────────────────────────── */
.col-resend-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.col-countdown-text {
  font-size: .82rem;
  color: var(--col-text-muted);
}

.col-countdown-text strong {
  color: var(--col-text);
  font-weight: 700;
}

.col-btn-text {
  background: none;
  border: none;
  padding: 0;
  font-size: .82rem;
  font-family: var(--col-font);
  font-weight: 600;
  color: var(--col-green-dark);
  cursor: pointer;
  outline: none;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: var(--col-transition);
}

.col-btn-text:hover {
  color: var(--col-green-deep);
  text-decoration-color: var(--col-green-dark);
}

.col-btn-text:disabled {
  color: var(--col-text-muted);
  cursor: not-allowed;
  text-decoration: none;
}

/* ── Change number link ──────────────────────────────────────────────────────── */
.col-change-number {
  display: block;
  text-align: center;
  margin-top: 16px;
  font-size: .8rem;
  color: var(--col-text-muted);
}

.col-change-number button {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  font-family: var(--col-font);
  color: var(--col-green-dark);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: var(--col-transition);
}

.col-change-number button:hover {
  color: var(--col-green-deep);
  text-decoration-color: var(--col-green-dark);
}

/* ── Registration form phone field ───────────────────────────────────────────── */
.col-reg-input-wrap {
  position: relative;
  display: block;
}

.col-reg-phone-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 17px !important;
  height: 17px !important;
  color: var(--col-text-muted);
  pointer-events: none;
  z-index: 1;
  flex-shrink: 0;
}

.col-reg-input-wrap input[type="tel"] {
  padding-left: 40px !important;
  width: 100%;
  box-sizing: border-box;
}

/* ── Verify button on registration ───────────────────────────────────────────── */
.col-reg-verify-btn {
  display: inline-flex;
  align-items: center;
  margin-top: 10px;
  padding: 9px 16px;
  background: linear-gradient(135deg, var(--col-green), var(--col-green-dark));
  color: #fff;
  border: none;
  border-radius: var(--col-radius-sm);
  font-size: .85rem;
  font-weight: 600;
  font-family: var(--col-font);
  cursor: pointer;
  transition: var(--col-transition);
  box-shadow: 0 2px 8px rgba(37, 211, 102, .3);
}

.col-reg-verify-btn:hover {
  opacity: .9;
  transform: translateY(-1px);
}

.col-reg-otp-section {
  margin-top: 14px;
}

.col-reg-otp-boxes {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.col-reg-confirm-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--col-green-dark);
  color: #fff;
  border: none;
  border-radius: var(--col-radius-sm);
  font-size: .85rem;
  font-weight: 600;
  font-family: var(--col-font);
  cursor: pointer;
  transition: var(--col-transition);
}

.col-reg-confirm-btn:hover {
  opacity: .9;
}

.col-reg-verified-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--col-success);
  margin-top: 8px;
}

.col-reg-verified-badge svg {
  width: 15px;
  height: 15px;
  stroke: var(--col-success);
}

/* ── Already logged in ────────────────────────────────────────────────────────── */
.col-already-in {
  font-size: .9rem;
  color: var(--col-text-muted);
  padding: 12px 0;
}

/* ── Animations ──────────────────────────────────────────────────────────────── */
@keyframes col-fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes col-shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-5px); }
  40%       { transform: translateX(5px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

@keyframes col-spin {
  to { transform: rotate(360deg); }
}

@keyframes col-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(37, 211, 102, .25); }
  50%       { box-shadow: 0 0 0 5px rgba(37, 211, 102, .1);  }
}

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  .col-panel {
    padding: 20px 16px 18px;
  }

  .col-tab {
    font-size: .8rem;
    padding: 11px 10px;
    gap: 5px;
  }
}

@media (max-width: 360px) {
  .col-tab {
    flex-direction: column;
    gap: 3px;
    padding: 9px 8px;
    font-size: .72rem;
  }

  .col-btn {
    font-size: .875rem;
    padding: 12px 16px;
  }
}